Dometic RM7030 User manual

Foreword
This service manual is the result of the
dedication of The Dometic Corporation and
its engineers in giving service people the
necessary instruction for making accurate
analyses of certain conditions. Provided is
a diagnostic chart leading a qualified
mechanic into the service manual pages to
locate and solve symptoms which may
occur. Dometic has continued its
commitment in providing service people
with this, the most up-to-date information
about servicing Dometic RV accessories.
.
form No. 3 106938.008 2/96 (Replaces OS1 684)

37
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
PAGE NO.
CONTENTS
RM7030/RM7732 DIAGNOSTIC FLOW CHART ........................... 1
SECTION 1
OPERATION
1.1 RM7030 (Prod. #921890201 & 921890301)
Refrigerator Operation .......................................................... 5
1.2 RM7030 (Prod. #921890401) Refrigerator Operation ................ 6
1.3 RM7732 Refrigerator Operation ............................................. 7
SECTION 2
AC VOLTAGE
AC Voltage Requirements ..................................................... 9
SECTION 3
AC COMPONENTS
Heating Element .................................................................. 9
SECTION 4
DC VOLTAGE
DC Voltage Requirements ..................................................... 9
SECTION 5
DC COMPONENTS
5.1 Thermostat: RM7030 (Prod. No. 921890201 & 921890301) ....... 9
5.2 Thermistor: RM7030 (Prod. No. 921890401) & RM7732 .......... 10
5.3 Thermistor Adjuster: RM7030 (Prod.No. 921890401)&RM7732 10
5.4 Solenoid Valve ................................................................... 10
5.5 Igniter ............................................................................... 11
5.6 High Voltage Cable ............................................................ 11
5.7 Fuses ............................................................................... 12
5.8 Upper Circuit Board ............................................................ 12
5.9 Lower Circuit Board ............................................................ 15
5.10 Door Switch....................................................................... 17
5.11 Electrode .......................................................................... 18
5.12 Climate Control Heater ....................................................... 18
SECTION 6
LP GAS
LP Gas Requirements ........................................................ 18
SECTION 7
LP GAS COMPONENTS
7.1 Manual Gas Shutoff Valve ................................................... 19
7.2 Orifice .............................................................................. 20
7.3 Thermocouple ................................................................... 20
7.4 Burner .............................................................................. 21
7.5 Flue Baffle ........................................................................ 21
7.6 Flue Cap (RM7030 Only) .................................................... 21

36
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
CONTENTS PAGE NO.
SECTION 8
WIRING
8.1 External Wiring .................................................................. 21
8.2 Internal Wiring ................................................................... 21
SECTION 9
OTHER
9.1 Leveling ............................................................................ 25
9.2 Ventilation ......................................................................... 25
9.3 Air Leaks .......................................................................... 25
9.4 Door Position ..................................................................... 27
9.5 Ambient Temperature ......................................................... 27
9.6 Cooling Unit ...................................................................... 27
9.7 Food Storage .................................................................... 27
9.8 High Humidity .................................................................... 27
9.9 Interior Liner Seal to Frame ................................................. 28
SECTION 10
ICE MAKER Ice Maker Operation ........................................................... 29
SECTION 11
ICE MAKER COMPONENTS
11.1 Mold Heater ...................................................................... 29
11.2 Ice Ejector......................................................................... 29
11.3 Mold Thermostat ................................................................ 29
11.4 Shutoff Arm ....................................................................... 30
11.5 Mold Switches ................................................................... 30
11.6 Timing Motor ..................................................................... 30
11.7 Water Valve ...................................................................... 30
11.8 Ice Maker Assembly ........................................................... 31
SECTION 12
ICE MAKER  OTHER
12.1 Water Fill Adjustment.......................................................... 34
12.2 Wiring............................................................................... 35
12.3 Water Supply..................................................................... 35

1
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
This program will address the most common system problems associated with the Dometic RM7030/RM7732
refrigerators supplied by The Dometic Corporation. Our intent is to provide you with a guideline of checks to make,
should you encounter one of the following symptoms.
1. No operation  no panel lights
2. No operation  has panel lights
3. Operating OK  no panel lights
4. No AC operation  operates on gas
5. No Gas operation  operates on AC
6. Insufficient cooling on all modes.
7. Insufficient cooling on AC  cools properly
on gas.
REFRIGERATOR SECTION
RM7030 REFRIGERATOR SECTION:
Product No. 921890201 & 921890301
SYMPTOM CAUSE REFER TO STEP
Operation 1.1 A
DC Volts 4A
Fuse 5.7 A
Wiring 8.1, 8.2
Upper Circuit Board 5.8 A
Lower Circuit Board 5.9 A,D
Operation 1.1 A
Thermostat 5.1
Upper Circuit Board 5.8 A
Solenoid 5.4 A
Wiring 8.2
Lower Circuit Board 5.9 B,C,D
DC Volts 4A
Wiring 8.2
Upper Circuit Board 5.8 B through I
Lower Circuit Board 5.9 D
Operation 1.1 A
AC Volts 2
Heating Element 3
Upper Circuit Board 5.8 B,C
Wiring 8.2
Thermostat 5.1
Lower Circuit Board 5.9 B
Operation 1.1 A
LP Gas 6
Manual Gas Valve 7.1
Igniter 5.5 A
High Voltage Cable 5.6 A
Electrode 5.11
Solenoid 5.4 A
Upper Circuit Board 5.8 B,D,E
Wiring 8.2
Lower Circuit Board 5.9 C
Ventilation 9.2
Leveling 9.1
Ambient Temperature 9.5
Air Leaks 9.3
Thermostat 5.1
Cooling Unit 9.6
AC Volts 2
Heating Element 3

2
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
8. Insufficient cooling on gas  cools properly on
AC.
9. Freezes on all modes.
10. Changes preset mode.
11. Flame failure light within 10 seconds.
12. Flame failure light after 3 minutes.
13. Interior light ON when door is closed.
14. Rapid formation of frost.
15. Water on frame.
SYMPTOM CAUSE REFER TO STEP
LP Gas 6
Orifice 7.2
Flue Baffle 7.5
Flue Tube 7.7
Flue Cap 7.6
Burner 7.4
Thermostat 5.1
DC volts 4A
DC Volts 4A
Wiring 8.1
Lower Circuit Board 5.9 A,B,C,D
Igniter 5.5 A
High Voltage Cable 5.6 A
Electrode 5.11
Wiring 8.2
LP Gas 6
Manual Gas Valve 7.1
Solenoid 5.4 A
Orifice 7.2
Burner 7.4
Wiring 8.2
Thermocouple 7.3 A
Wiring 8.2
Door Switch 5.10
Door Position 9.4
Food Storage 9.7
Interior Liner to Frame 9.9
High Humidity 9.8
Air Leaks 9.3
Interior Liner to Frame 9.9
High Humidity 9.8
Air Leaks 9.3
Climate Control Heater 5.12
Operation 1.1B or 1.2
DC Volts 4B
Fuse 5.7 B
Wiring 8.1 & 8.2
Upper Circuit Board 5.8 J
Lower Circuit Board 5.9 E
Operation 1.1B or 1.2
DC volts 4B
Thermistor 5.2
Fuses 5.7 B
Upper Circuit Board 5.8 J
Wiring 8.2
Lower Circuit Board 5.9 E,F,G
RM7030 (Prod. No. 921890401)
& RM7732
16. No operation  no panel lights
17. No operation  has panel lights

3
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
SYMPTOM CAUSE REFER TO STEP
18. No AC operation  operates on gas.
19. No gas operation  operates on AC
20. Insufficient cooling on all modes.
21. Insufficient cooling on AC  cools properly on
gas.
22. Insufficient cooling on gas  cools properly on
AC.
23. Freezes.
24. Changes preset mode.
25. Check light on.
Operation 1.1B or 1.2
AC Volts 2
Fuse 5.7 B
Heating Element 3
Upper Circuit Board 5.8 J
Wiring 8.2
Lower Circuit Board 5.9 E,F
Operation 1.1B or 1.2
LP gas 6
Manual Gas Valve 7.1
Igniter 5.5 B
High Voltage Cable 5.6 B
Electrode 5.11
Solenoid 5.4 B
Upper Circuit Board 5.8 J
Wiring 8.2
Lower Circuit Board 5.9 E,G
Ventilation 9.2
Leveling 9.1
Ambient Temperature 9.5
Air Leaks 9.3
Thermistor 5.2
Cooling Unit 9.6
Thermistor Adjuster 5.3
AC Volts 2
Heating Element 3
Lower Circuit Board 5.9 E,F
LP Gas 6
Orifice 7.2
Flue Baffle 7.5
Flue Tube 7.7
Flue Cap (RM7030 Only) 7.6
Burner 7.4
Lower Circuit Board 5.9 E,G
Thermistor 5.2
Thermistor Adjuster 5.3
Lower Circuit board 5.9 E,F,G
Upper Circuit Board 5.8 J
Operation 1.1B or 1.2
DC Volts 4B
Wiring 8.1
Upper Circuit Board 5.8 J
Lower Circuit Board 5.9 E
DC Volts 4
Wiring 8.2
LP Gas 6
Manual Gas Valve 7.1
Solenoid 5.4 B
Orifice 7.2
Burner 7.4
Lower Circuit Board 5.9 E,G
Thermocouple 7.3 B

4
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
26. Interior light on when door is closed.
27. Rapid formation of frost.
28. Water on frame.
ICE MAKER SECTION
29. Ice Maker fails to start.
30. Ice Maker won't make ice.
31. Keeps making ice and won't shut off.
32. Not making enough ice.
33. Too much water is coming out.
34. Ejector blade frozen into ice cubes.
35. Unit is hooked-up  no water comes in.
36. Ice maker is running but won't make cubes.
37. Ice maker will not eject ice.
SYMPTOM CAUSE REFER TO STEP
Wiring 8.2
Door Switch 5.10
Door Position 9.4
Food Storage 9.7
Interior Liner to Frame 9.9
High Humidity 9.8
Air Leaks 9.3
Interior Liner to Frame 9.9
High Humidity 9.8
Air leaks 9.3
Climate Control Heater 5.12
Operation 10
Arm in UP Position 11.4
AC Voltage 2
Water Valve 11.7
Ice Maker Cycle 11.8
Blades frozen in ice 12.1
AC Voltage 2
Water Valve 11.7
Ice Maker Cycle 11.8
Shutoff Arm 11.4
Operation 10
Mold Thermostat 11.3
Cube Size 12.1
Ice Maker Cycle 11.8
Water Fill Adjustment 12.1
Water Valve 11.7
Water Fill Adjustment 12.1
Water Valve 11.7
Water Supply 12.3
Water Valve 11.7
Water Supply 12.3
Shutoff Arm 11.4
Mold thermostat 11.3
Hold Switch 11.5
Ice Ejector 11.2
Mold Heater 11.1
Timing Motor 11.6

5
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
AES FULLY AUTOMATIC MODE
Turn switch "C" to the "ON" position. The bulb above
push-button "A" will light up green, indicating that the
control system is in the fully automatic mode. In this
mode, 120 volts AC operation has first priority, meaning
the refrigerator will operate on 120 volts AC whenever it
is available. If 120 volts AC is not available, the system
will automatically switch to LP gas operation. The
thermostat inside the refrigerator cabinet cycles the
element/burner as required to maintain the desired
temperature.
NOTE: The AES controls will automatically go to the
fully automatic mode each time switch "C" is turned
"ON".
LP GAS OPERATION
When there is no electrical power available (120 volts
AC) or if the indicator lamp above button "B" is ON, the
AES system will switch to LP gas operation. When the
thermostat in the refrigerator cabinet calls for cooling,
the following sequence takes place:
A. A high voltage spark is created above the burner.
B. Power is sent to a solenoid which opens the gas
control, allowing LP gas to flow to the burner. The
spark ignites the LP gas and the small flame pro-
vides heat for the boiler.
C. The electrode mounted above the burner tube
monitors the flame continuously. If the flame should
fail for any reason, the high voltage spark will start
immediately and relight the flame.
When the thermostat reaches the desired temperature,
it will shut off the gas flame completely. The system will
remain on standby until cooling is again required.
LP GAS ONLY OPERATION
Turn switch "C" to the "ON" position and press push-
button "B". The green indicator lamp over push-button
"B" will come on and the refrigerator will operate only on
LP gas even if 120 volts are available. When the vehicle
engine is turned "OFF", the AES system initiates a 25
minute delay, preventing the refrigerator from operating
on LP gas.
LP GAS DELAY MODE
When the vehicle engine is turned off, the AES system
initiates a delay cycle which prevents the refrigerator
from operating on LP gas for 25 minutes. The purpose
of the delay is to avoid having a gas flame burning dur-
ing a refueling stop at a gas station (see WARNING).
If the vehicle engine is restarted during this delay pe-
riod, the LP gas operation will not start until the delay
period is over. This means each time the vehicle engine
is stopped, the complete 25 minute delay cycle will take
place. If 120 volt AC becomes available during this de-
lay cycle, the AES system will start operation in the 120
volt AC mode immediately, unless the push-button "B"
(LP gas only) has been pressed.
If the RV is stopped somewhere other than a gas sta-
tion, you may wish to cancel the delay cycle. To do this,
turn the main system switch to "OFF" for several sec-
onds, then turn the main system switch back to "ON"
and the system will immediately start operation in the
LP gas mode.
Most LP gas appliances used in recreational ve-
hicles are vented to the outside of the vehicle. When
parked close to a gasoline pump, it is possible that
the gasoline fumes could enter this type of appli-
ance and ignite from the burner flame, CAUSING A
FIRE OR AN EXPLOSION.
FOR YOUR SAFETY, it is recommended that all LP
gas appliances which are vented to the outside
should be shut off when refueling.
The AES system is designed to turn off the LP flame
during refueling stops by the use of the delay cycle
explained previously. However, you must remember
that the delay cycle will be activated only if the
refrigerator is properly connected to the vehicle
engine electrical circuit.
If the refrigerator is not connected to the engine by
the ignition lock wiring, the refrigerator must be
shut off during refueling. To do this, turn the main
system switch "C" to "OFF". Only after the vehicle
has been moved away from the refueling area
should the main system switch "C" be turned back
ON.
SECTION 1
1.1 OPERATION
RM7030 (Product No. 921890201 & 921890301)
OFF ON
AC
A B C D E F G H

6
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
FLAME FAILURE DURING LP GAS
OPERATION
If the LP gas flame fails during the burner cycle, the
high voltage spark will continue arcing for up to three
minutes.
At the end of three minutes the gas control will stop the
flow of LP gas to the burner, the sparking will stop and
the red indicator lamp "H" will light up. LP gas operation
will not be possible as long as this indicator is ON.
To restart LP gas operation, turn the main system
switch "C" to "OFF" for five seconds and then back ON.
This will reset the AES controls and turn off the flame
failure indicator "H". The system will start another cycle
for gas ignition.
If the refrigerator has not been used for a long time or
the LP tanks have just been refilled, air may be trapped
in the supply lines. To purge the air from the lines may
require resetting (turning OFF and ON) the On/Off
switch "C" three or four times.
If repeated attempts fail to start the LP gas operation,
check to make sure that the LP gas supply tanks are
not empty and all manual Shutoff valves in the lines are
open.
NOTE: If you are in the AES mode when the flame
failure light "H" comes on, the mode indicator lamp "A"
(green light) will go out. If 120 volt AC power becomes
available during this period, the mode indication lamp
will come on showing that the refrigerator is operating
on another energy source. The red lamp "H" will remain
on until the AES system is reset with an OFF/ON
operation of the main switch "C". If you have selected
the LP gas only mode (control button "B"), the 120 volt
function has been locked out. If the burner fails to light,
the green lamp over button "B" will go out and the red
lamp "H" will glow indicating flame failure. Even if 120
volts is available, the refrigerator cannot switch to
electric operation and all cooling will stop. This fact must
be considered when selecting "gas only" operation.
120 VOLTS AC OPERATION
Since 120 volt AC is usually the most economical
source for operation of the refrigerator, the AES control
system is designed to select this mode whenever it is
available. The only exception to this is when push-
button "B" (LP gas only mode) is selected. The 120 volt
heating elements attached to the boiler provide the heat
necessary to operate the cooling system. The thermo-
stat controls the power ON and OFF to the elements
and maintains the desired temperature.
LOW VOLTAGE MONITOR
The AES system requires 12 volts DC power at all times
to operate properly. The DC power must be 9.5 volts
DC or higher. If the DC voltage drops below 9.5 volts
DC, the AES system will switch to an emergency
cooling mode.
1. The mode indicator lamp will go off (green light);
2. The system will revert to continuous LP gas
operation, with no thermostat control.
The refrigerator will continue to operate in the emer-
gency mode until the DC power supply is increased to
10.5 volts DC. When 10.5 volts is reached, the mode
indicator light (green) will come back on and normal
operation will resume.
During the low voltage condition, the interior light will
operate normally.
THERMOSTAT
The refrigerator is equipped with a thermostat that can
be adjusted to maintain various temperatures. Turn the
knob clockwise toward "MAX" for a lower temperature
and for a warmer temperature  turn the knob counter-
clockwise toward "MIN". Set the thermostat approxi-
mately mid-range and adjust it toward "MIN" or MAX" to
obtain the desired cabinet temperatures. Remember, at
the "MAX" setting, the heating element/burner is running
continuously and the lower cabinet temperatures are
obtained.
1.2 RM7030 (Product No. 921890401)
AES MODE
1. Move the AES mode selector button (2) to the
DOWN position. If 120 volts AC is available, the AC
mode indicator lamp "A" will illuminate indicating AC
operation. If 120 volts AC is not available, the GAS
mode indicator lamp "C" will illuminate and the
control system will automatically switch to GAS
operation.
2. If the CHECK indicator lamp "D" illuminates and the
GAS mode indicator lamp "C" is off, the controls
have failed to ignite the burner in the GAS mode.
GAS operation may be reset by pressing main power
ON/OFF button (1) to the OFF then ON position.
AES DISPLAY PANEL

7
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
3. Press the TEMPERATURE SELECTOR button (3)
until the lamp at the desired position is illuminated.
4. When operating in the AES mode, the AES mode
indicator lamp "B" will illuminate. The control system
will automatically select between AC and GAS
operation with AC having priority over GAS. Either
the AC indicator lamp "A" or the GAS indicator lamp
"C" will illuminate depending on the energy source
selected by the control system. If the control system
is operating with AC energy and it then becomes
unavailable, the system will automatically switch to
GAS. As soon as AC becomes available again, the
control will switch back to AC regardless of the
status of GAS operation.
GAS MODE
1. Move the AES mode selector button (2) to the UP
position. The GAS mode indicator lamp "C will
illuminate. After 45 seconds the burner should be
ignited and operating normally.
2. On the initial refrigerator start-up, it may take longer
than 45 seconds to allow air to be purged from the
gas line. If the gas does not ignite within 45 seconds,
the CHECK indicator lamp "D" will illuminate and the
GAS mode indicator lamp "C" will go off. To reset
when the CHECK indicator lamp "D" is illuminated,
press the main power ON/OFF button (1) to the OFF
then ON position.
If the control is switched to AC operation while
the CHECK indicator lamp is on, it will function
properly, but the CHECK indicator lamp will not go
off until the main power ON/OFF button is pressed to
the OFF then ON position.
NOTE: Do not continue to reset GAS operation if
the CHECK indicator lamp continues to be illumi-
nated after several tries. If repeated attempts fail to
start the LP gas operation, check to make sure that
the LP gas supply tanks are not empty and all
manual shutoff valves in the lines are open.
3. Press the TEMPERATURE SELECTOR button (3)
until the lamp at the desired position is illuminated.
THERMOSTAT
The thermostat on the refrigerator controls both the gas
and electric operation, thereby eliminating the necessity
of resetting each time a different energy source is
employed.
After the initial start-up, the thermostat should be moved
from "COLDEST" to the desired temperature setting,
usually about mid-setting.
STANDBY MODE OF OPERATION
This control system contains a feature where it will
continue to operate the cooling system in the event of a
failure of a major operating component. Two different
modes of operation can occur in this category.
If for some reason the display module becomes non-
functional, the control system will revert to fully auto-
matic operation  selecting the best energy source
available with AC and GAS priority. The temperature of
the refrigerator will be maintained at the MID position
within normal temperature tolerances. The power
module will continually attempt to reestablish operation
of the display module.
The second standby mode of operation will execute
when a failure of the temperature sensing device or
associated electronic circuitry occurs. If this should
occur, the control system will operate on the energy
source selected via the control panel. The cooling unit
will run continuously on the selected energy source. The
refrigerator will continue to operate in this mode indefi-
nitely or until a new sensor is installed and the system is
reset.
1.3 RM7732 REFRIGERATOR OPERATION
ACDE
2-WAY DISPLAY PANEL
B
AUTO MODE
Press the AUTO mode selector button (2) to the DOWN
position. If 120 volts AC is available, the AC mode
indicator lamp (A) will illuminate indicating AC operation.
If 120 volts AC is not available, the GAS mode indicator
lamp (C) will illuminate and the control system will
automatically switch to GAS operation.
If the CHECK indicator lamp (D) illuminates and the
GAS mode indicator lamp (C) is OFF, the controls have
failed to ignite the burner in the GAS mode. GAS
operation may be reset by pressing the main power ON/
OFF button (1) to the OFF then ON position. (See GAS
MODE.
Press the TEMPERATURE SELECTOR button (3) until
the lamp at the desired position is illuminated.

8
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
GAS MODE
Move the AUTO mode selector button (2) to the UP
position. The GAS mode indicator lamp (C) will illumi-
nate. After 45 seconds the burner should be ignited and
operating normally.
On the initial refrigerator start-up, it may take longer
than 45 seconds to allow air to be purged from the gas
line. If the gas does not ignite within 45 seconds, the
CHECK indicator lamp (D) will illuminate and the GAS
mode indicator lamp (C) will go off. To reset when the
CHECK indicator lamp (D) is illuminated, press main
power ON/OFF button (1) to the OFF then ON position.
NOTE: DO NOT continue to reset GAS operation if
the CHECK indicator lamp continues to be illumi-
nated after several tries.
Press the TEMPERATURE SELECTOR button (3) until
the lamp (E) at the desired position is illuminated.
THERMOSTAT
The thermostat on the refrigerator controls both the gas
and electric operation, thereby eliminating the necessity
of resetting each time a different energy source is
employed.
After the initial start-up, the thermostat should be moved
from "COLDEST" to the desired temperature setting is
usually about mid-setting.
TO SHUT OFF THE REFRIGERATOR
The refrigerator may be shut off while in any mode of
operation by pressing the main power ON/OFF button
(1) to the UP (OFF) position. This shuts off all DC power
to the refrigerator, including the interior light.
DESCRIPTION OF OPERATING
MODES
AUTO MODE
When operating in the AUTO mode, the AUTO mode
indicator lamp (B) will illuminate. The control system will
automatically select between AC and GAS operation
with AC having priority over GAS. Either the AC indica-
tor lamp (A) or the GAS indicator lamp (C) will illuminate
depending on the energy source selected by the control
system. If the control system is operating with AC
energy and it then becomes unavailable, the system will
automatically switch to GAS. As soon as AC becomes
available again, the control will switch back to AC
regardless of the status of GAS operation.
GAS MODE
When operating in the GAS mode, the AUTO mode
indicator lamp (B) will be off and the GAS mode indica-
tor lamp (C) will be illuminated. This mode provides LP
gas operation only. The control system will activate the
ignition system and will attempt to light the burner for a
period of approximately 45 seconds. If unsuccessful,
the CHECK indicator lamp (D) will illuminate and the
GAS mode indicator lamp (C) will turn off.
To restart GAS operation, press the main power ON/
OFF button (1) to the OFF and then ON position. The
control system will attempt a new 45 second ignition
sequence.
If the refrigerator has not been used for a long time or
the LP tanks have just been refilled, air may be trapped
in the supply lines. To purge the air from the lines may
require resetting the main power ON/OFF button (1)
three or four times. If repeated attempts fail to start the
LP gas operation, check to make sure that the LP gas
supply tanks are not empty and all manual shutoff
valves in the lines are open.
If the control is switched to AC or DC operation while
the CHECK indicator lamp is on, it will function properly,
but the CHECK indicator lamp will not go off until the
main power ON/OFF button is pressed to the OFF then
ON position.
STANDBY MODE OF OPERATION
This control system contains a feature where it will
continue to operate the cooling system in the event of a
failure of a major operating component. Two different
modes of operation can occur in this category.
If for some reason the display module becomes non-
functional, the control system will revert to full automatic
operation selecting the best energy source available
with AC as first priority, and GAS as the second priority.
The temperature of the refrigerator will be maintained at
the MID position within normal temperature tolerances.
The power module will continually attempt toreestablish
operation of the display module.
The second standby mode of operation will execute
when a failure of the temperature sensing device or
associated electronic circuitry occurs. If this should
occur, the control system will operate on the energy
source selected via the control panel. The cooling unit
will run continuously on the selected energy source. The
refrigerator will continue to operate in this mode indefi-
nitely or until a new sensor is installed and the system is
reset.

9
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
SECTION 2
AC VOLTAGE REQUIREMENTS
The refrigerator is a 120 volt AC, 60 Hz appliance. The
proper operating range is 100 to 132 volts. Check the
AC volts at the receptacle where the refrigerator is
attached. If voltage is outside of the proper operating
range, correct the power source problem.
On RM7030 (Product No. 921890401) and RM7732, if
voltage drops below 100 volts, cooling efficiency will
decrease with voltage decrease. The refrigerator will not
switch to another mode of operation until allAC power
is lost.
SECTION 3
ACCOMPONENTS
HEATING ELEMENT
The heating element is designed to deliver a predeter-
mined amount of heat to the cooling unit. To check a
heating element, remove the heater leads from the
printed circuit board and measure for proper resistance
across the two leads with a properly calibrated ohm
meter. This check is to be done with the heating ele-
ment at room temperature. The proper ohms for each of
the two RM7030 and RM7732 heating elements is 69,
with a tolerance of ten percent. If the resistance is
outside the tolerance range, replace the heating ele-
ment.
SECTION 4
DC VOLTAGE REQUIREMENTS
A. RM7030 (Product No. 921890201 &
921890301)
For the refrigerator to operate on any mode, DC voltage
must be supplied to the terminals at the rear of the
refrigerator and must be connected directly to the
battery of the RV. The operational range is 10.5 to 15
volts DC. Connecting the refrigerator to an unregulated
converter can result in improper operation of the refrig-
erator. Do not use the body or chassis of the RV as a
substitute for either of the two conductors. Proper
polarity is crucial for the operation of the refrigerator.
Check for proper voltage at the positive and negative
terminals at the back of the refrigerator. If power is
outside the operational range, correct the power supply
problem. The power supply to the refrigerator must be
fused. Maximum fuse size: 5 amps.
With the refrigerator operating on AC or gas mode, if
voltage to the refrigerator slowly drops to or below 9.5
volts DC, the gas flame will come on and will not be
thermostatically controlled. Low DC volts (below 9.5)
could cause over-cooling.
B. RM7030 (Prod. No. 921890401) & RM7732
For the refrigerator to operate on any mode, DC voltage
must be supplied to the terminals at the rear of the
refrigerator.
The operational range of the unit is a minimum of 9.6V
DC to a maximum of 22V DC. The unit will automatically
shut down until voltage has decreased to 18V DC. The
refrigerator requires at least 9.6V DC for proper opera-
tion; however, the panel lights will continue to illuminate
until voltage has dropped to 4V DC or below.
Connecting the refrigerator to an unregulated converter
can result in improper operation of the refrigerator. Do
not use the body or chassis of the RV as a substitute for
either of the two conductors. Proper polarity is crucial
for refrigerator operation. Check for proper DC voltage
at the positive and negative terminals at the back of the
unit. If the voltage is outside the operational range,
correct the power supply problem.
SECTION 5
DC COMPONENTS
5.1 THERMOSTAT
RM7030 (Product No. 921890201 & 921890301)
The thermostat operates on DC volts and regulates the
inside refrigerator temperature on all modes, by making
and breaking the circuit to the printed circuit board. The
internal mechanism breaks contact (continuity) when
adequate cabinet temperature has been reached.
Check the thermostat for continuity. This check should
be made at room temperature with the thermostat
turned all the way to MAX. Another check would be to
use a jumper wire with insulated clips and bypass the
thermostat.
NOTE: Use care when doing this test. Do not short to
thermostat casing. Also remove jumper after testing is
completed.
If the above test allows the refrigerator to operate and/
or the continuity test proves the thermostat to be
defective, replace the thermostat. A defective thermo-
stat would cause insufficient cooling, no cooling or
freezing on all modes.

10
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
5.2 THERMISTOR
RM7030 (Prod. No. 921890401) and RM7732
To determine if the temperature sensor is functioning
properly, perform the following test.
Remove the cover from the lower circuit board. Discon-
nect the thermistor harness from the P2, 2-pin terminal
on the lower circuit board. Place thermistor in a glass of
ice water. Wait 2 to 3 minutes. Using an ohm meter,
place a probe on each terminal point. You should get a
reading of approximately 7,000 to 10,000 ohms. Normal
failure for this type of device is to have a very high
resistance. A defective thermistor could cause an over-
cooling condition on all modes.
5.3 THERMISTOR ADJUSTER
RM7030 (Product No. 921890401) and RM7732
The thermistor adjuster is a resistor-type component
that attaches between the thermistor and the lower
board. Its function is to allow the refrigerator to reach
temperatures below the normal 46° to 35°F. range
(setting 1 through 5 on upper circuit board).
To determine if the thermistor adjuster is operating
properly, do an ohms resistance check across the
terminals. Proper ohms reading is approximately 23,200
ohms ± 10%.
5.4 SOLENOID VALVE
A. RM7030 (Product No. 921890201 & 921890301)
The solenoid valve assembly is a safety valve as well as
a gas flow valve. When the AES selects LP gas opera-
tion, DC volts are sent to the solenoid coil which opens
the internal valve.
Check the solenoid coil with a properly
calibrated ohm meter. Remove the
connector from the solenoid
and measure the resis-
tance across the upper
and lower terminals. The
proper reading would be
20 ohms with a toler-
ance range of ten
percent. Once flame is
lit, the thermocouple
produces the voltage to keep
the valve open. If for any reason the thermocouple does
not provide enough current to the valve, it will close,
stopping the flow of gas. To check this portion of the
solenoid valve assembly, verify the thermocouple is
good (see Sec. 7.3A), the tip is clean and the receptacle
in the solenoid valve assembly is clean. If the thermo-
couple checks good, then replace the solenoid valve
assembly.
NOTE: If the solenoid ohms check shows an open coil,
the refrigerator will not operate on any mode.
P2
THERMISTOR
ADJUSTER
TO THERMISTOR
NOTE: Dometic refrigerators do not come equipped with a
thermistor adjuster. This is an add-on component.
THERMISTOR
ADJUSTER
TO THERMISTOR
B. RM7030 (Product No. 921890401) and RM7732
When the refrigerator selects LP gas operation, DC
volts are sent to the solenoid coil which opens the
internal valve.
Check the solenoid coil with a properly calibrated ohm
meter. Remove the connector from the solenoid and
measure the resistance across the terminals. The
proper reading would be 49 ohms with a tolerance
range of ten percent.
P1
P2
P3
Thermistor
unplugged
from PC
Board

11
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
Next, hook up a manometer at
the test port. Then
check for DC volts at
gas valve terminals
while the unit is in
trial-for-ignition. If DC
volts are present and
pressure is low,
replace the valve. If DC
volts are not present at
the valve while unit is in
trial-for-ignition, verify that the wires at Plug 3,
Terminal 1 and 2 on lower circuit board have DC volts
(9 or more). If the valve chatters, check for low input
voltage to the valve (below 9V DC).
5.5 IGNITER
A. RM7030 (Product No. 921890201 & 921890301)
The igniter is an electronic device that produces high
voltage to create a spark at the burner, only on gas
mode. It also produces an increased DC voltage at the
"L" terminal which is a signal to the circuit board that a
spark has been produced. First verify proper voltage at
the positive (+) and ground () terminals. The reading
should be within one volt of incoming voltage at the
main terminal block. A voltage drop of more than one
volt would indicate a loose connection (see Sec. 8.2) or
a circuit board problem (see Sec. 5.9A to 5.9D).
Next, disconnect DC power at refrigerator terminal
block. Remove high voltage cable from igniter. Recon-
nect DC power  the igniter should produce sparking
sound. If not, replace the igniter. With the igniter pro-
ducing spark, connect meter leads to "L" and ground ()
terminals on the igniter, with the meter set on 20 volts
DC range or lower. The meter should read a pulsating
voltage. If not, replace the igniter.
NOTE: If a spark is not
produced within 10
seconds, the gas flame
warning lamp will illumi-
nate. If spark is produced
it will take 3 minutes for
lamp to illuminate.
If all of the previous
checks are correct, the
igniter is good  do not
replace.
B. RM7030 (Product No. 921890401) and RM7732
The igniter is an electronic device that produces high
voltage to create a spark at the burner, only on gas
mode.
First, verify proper voltage at the positive (+) and
ground () terminals. The reading should be within one
volt of incoming
voltage at the main
terminal block during
trial-for-ignition.
If no voltage is
present, see Sec.
5.9E to 5.9G.
Next, disconnect DC power
at refrigerator terminal block.
Remove high voltage cable
from igniter. Reconnect DC
power, the igniter should
produce a sparking sound
duringtrial-for-ignition. If not,
replace the igniter.
5.6 HIGH VOLTAGE CABLE
A. RM7030 (Product No. 921890201 & 921890301)
Disconnect DC power at the refrigerator terminal block.
Disconnect high voltage cable from electrode. Recon-
nect DC power. If sparking starts, cable is good (see
Sec. 5.11). If no sparking, disconnect DC power. If
sparking sound from igniter, then replace high voltage
cable.
B. RM7030 (Product No. 921890401) and RM7732
Disconnect DC power at the refrigerator terminal block.
Disconnect high voltage cable from electrode. Recon-
nect DC power. If sparking startsduring trial-for-ignition,
the cable is good (see Sec. 5.11). If there is no sparking
during trial-for-ignition, disconnect DC power and
disconnect high voltage cable at the igniter. Reconnect
DC power. If there is a sparking sound from the igniter
during trial-for-ignition, then replace high voltage cable.
HIGH VOLTAGE

12
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
5.7 FUSES
A. RM7030 (Product No. 921890201 & 921890301)
The fuse is to protect the circuit board. To check the
fuse, remove it from the holder and do a continuity
check. If no continuity, replace it with a proper 3-amp
time delay fuse.
B. RM7030 (Product No. 921890401) and RM7732
The fuses are to protect the circuit board and the
integrity of the heater circuit(s) against shorts.
The 3-amp DC fuse is designed to protect the circuit
board from internal shorts. The 5-amp AC fuse is
designed to protect the integrity of the AC heater circuit
from shorts.
To check the fuses, remove from the holder and do a
continuity check. If no continuity, replace with a proper
amperage fuse.
NOTE: Determine the cause of the fuse failure and
correct before replacing fuse.
7-PIN
CONNECTOR
6-PIN
CONNECTOR 10-PIN
CONNECTOR
5.8 UPPER CIRCUIT BOARD
RM7030 (Product No. 921890201 & 921890301)
A. ON-OFF SWITCH
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring
harness. The checks are to be done with the
wiring harnessREMOVED from the lower
circuit board.
With the switch in the "ON" position:
CONTINUITY should be indicated be-
tween the orange terminal to the yellow
terminal on the 10-pin connector.
ORANGE
YELLOW
10 PIN
CONTINUITY should be indicated between
the brown terminal to the red terminal on the
10-pin connector.
BROWN
RED
10 PIN
YELLOW
GREEN
10 PIN
RED
BLUE
10 Pin7Pin
NO continuity should be indicated between
the yellow terminal to the green terminal
on the 10-pin connector.
NO continuity should be indicated
between the red terminal on the 10-
pin connector to the blue terminal
on the 7-pin connector.
With the switch in the "OFF"
position:
CONTINUITY should be indicated
between the yellow terminal to the green
terminal on the 10-pin connector.
YELLOW
GREEN
10 PIN
RED
BLUE
10 Pin7Pin
CONTINUITY should be indicated
between the red terminal on the 10-
pin connector to the blue terminal on
the 7-pin connector.
NO continuity should be indicated
between the orange terminal to the
yellow terminal on the 10-pin connector.
NO continuity should be indicated between the
brown terminal to the red terminal on the 10-
pin connector.
NOTE: If any of these checks on the ONOFF
switch are not correct, verify the wire harness
has continuity. If the wire harness is good,
replace the upper circuit board.
BROWN
RED
10 PIN
ORANGE
YELLOW
10 PIN

13
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
B. AES FUNCTION SWITCH
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring harness.
The checks are to be done with the wiring harness
REMOVED from the lower circuit board, and the ON-
OFF switch turned to "ON".
With the AES function switch manually
depressed:
CONTINUITY should be indicated
between the blue terminal and the
black terminal on the 7-pin connector.
With the AES function switch NOT
depressed:
NO continuity should be indicated
between the blue and black terminals
on the 7-pin connector.
NOTE: If the check on AES function switch is not
correct, verify the wire harness has continuity. If wire
harness is good, replace the upper circuit board.
C. AES FUNCTION LAMP
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring harness.
These checks are to be done with the wiring harness
REMOVED from the lower circuit
board and the ONOFF switch
turned to "ON".
Measure resistance between the
brown terminal on the 7-pin
connector (positive [+] lead from
meter) to the brown terminal on
the 10-pin connector (negative
[] lead from meter). The proper resistance is
approximately 26,000 ohms.
NOTE: If the check on the AES function lamp is not
correct, verify the wire harness has continuity. If wire
harness is good, replace the upper circuit board.
D. GAS FUNCTION SWITCH
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring harness.
The checks are to be done with the wiring harness
REMOVED from the lower circuit board and the ON-
OFF switch turned to "ON".
BROWNBROWN
10 Pin7Pin
BLACK
BLUE
7Pin
With the gas function switch
manually depressed: CONTI-
NUITY should be indicated
between the violet terminal on
the 10-pin connector to the
blue terminal on the 7-pin
connector. With the gas
function switch NOT de-
pressed:
A reading wouldNOT be indicated.
NOTE: If the check on gas function switch is not
correct, verify the wire harness has continuity. If wire
harness is good, replace the upper circuit board.
E. GAS FUNCTION LAMP
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring harness.
These checks are to be done with the wiring harness
REMOVED from the lower
circuit board, and the ONOFF
switch turned to "ON".
Measure resistance between the
brown terminal on the 10-pin
connector (negative [] lead
from meter) to the white terminal
on the 10-pin connector (positive
[+] lead from meter). The proper
ohms resistance is approxi-
mately 26,000 ohms.
NOTE: If the check on gas function lamp is not
correct, verify the wire harness has continuity. If wire
harness is good, replace the upper circuit board.
F. AC MODE LAMP AND SWITCH
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring harness.
These checks are to be done with the wiring harness
REMOVED from the lower circuit board, and the ON-
OFF switch turned to "ON".
With the mode switch (?) manually depressed:
Resistance should be indicated between the brown
terminal on the 10-pin connector (negative [] lead
from meter) to the
red terminal on the 7-
pin connector (posi-
tive [+] lead from
meter). The proper
resistance is approxi-
mately 26,000 ohms.
7PIN 10 PIN
VIOLET
BLUE
WHITE
BROWN
10 PIN
7PIN 10 PIN
RED BROWN

14
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
With the mode switch (?) NOT depressed: A
reading wouldNOT be indicated.
NOTE: If the check on AC mode lamp and switch is
not correct, verify the wire harness has continuity. If
wire harness is good, replace the upper circuit
board.
G. DELAY MODE LAMP AND SWITCH
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring harness.
The checks are to be done with the wiring harness
REMOVED from the lower circuit board, and the
OFF-ON switch turned to "ON".
With the mode switch (?) manually depressed:
Resistance should be indicated between the brown
terminal on the 10-pin connector (negative [] lead
from meter) to the yellow terminal on the 7-pin
connector (positive [+] lead from meter). The proper
resistance is approximately
26,000 ohms.
With the mode switch (?) NOT
depressed: A reading wouldNOT
be indicated.
NOTE: If the check on the delay
mode lamp and switch is not
correct, verify the wire harness
has continuity. If wire harness is good, replace the
upper circuit board.
H. GAS MODE LAMP AND SWITCH:
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring harness.
The checks are to be done with the wiring harness
REMOVED from the lower circuit board, and the ON-
OFF switch turned to "ON".
With the mode switch (?) manually depressed:
Resistance should be indicated between the brown
terminal on the 10-pin connector (negative [] lead
from meter) to the green terminal
on the 7-pin connector (positive [+]
lead from meter). The proper
resistance is approximately 26,000
ohms.
With the mode switch (?) NOT
depressed: A reading would NOT
be indicated.
NOTE: If the check on gas mode lamp and switch is
not correct, verify the wire harness has continuity. If
wire harness is good, replace the upper circuit
board.
YELLOW BROWN
10 Pin7Pin
BROWN
10 Pin7Pin
GREEN
I. GAS FLAME WARNING LAMP:
NOTE: The following checks should be made on the
upper circuit board and harness assemblyBEFORE
replacing the upper circuit board or wiring harness.
The checks are to be done with the wiring
harnessREMOVED from the lower circuit
board, and the OFF-ON switch turned to
"ON".
Measure resistance between the brown
terminal on the 10-pin connector (negative
[] lead from meter) to the black terminal on
the 10-pin connector (positive [+] lead from
meter). The proper resistance is approxi-
mately 22,000 ohms.
NOTE: If the check on gas flame warning lamp is not
correct, verify the wire harness has continuity. If wire
harness is good, replace the upper circuit board.
J. RM7030 (Product No. 921890401) and RM7732
NOTE: The PAL tester will allow for proper testing of the
integrity of the upper and lower circuit boards. PAL is
available from your Dometic parts distributor.
NOTE: Each of the following tests should be done
according to pin locations. The wire colors may
vary.
With main ON/OFF switch on display panel in OFF
position:
Check for DC voltage at Plug 1, Terminal 4 and terminal
5 negative () DC on the lower circuit board. If no
voltage, then check fuse condition. Replace if blown.
Check for DC voltage between J4 and J10 terminals on
the lower circuit board. If fuse is good and there is
battery voltage at J4, remove and replace lower circuit
board.
Next, check for DC voltage at the upper circuit board
between terminal 4 (orange or white wire) and terminal
3 (black wire) which is negative () DC. If no voltage,
and your previous check proved voltage at the lower
circuit board between these wires, replace the cable
assembly. If DC volts are present, proceed to the next
check.
BLACK
BROWN
10 Pin
UPPER CIRCUIT BOARD

15
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
DIAGNOSTIC MODE
NOTE: The PAL tester will allow for proper
testing of the integrity of the upper and lower
circuit boards. PAL is available from your Dometic
parts distributor.
This control system has an integral Diagnostic/
Test sequence.
Access to the diagnostic sequence unit is by
means of the ON/OFF Power Switch and the
Temperature Selector Switch. With the Power
Switch in the OFF position, hold the Temperature
Selector Switch in the DOWN position. While
keeping the Temperature Selector Switch in the
DOWN position, move the main power ON/OFF
Switch to the ON (DOWN) position. Hold the
Temperature Selector Switch DOWN for three (3)
seconds. The control will indicate that the diag-
nostics have been entered by illuminating each of
the Mode Indicator Lamps and the Temperature
Indicator Lamps one at a time in sequence. Each
lamp is illuminated twice. The Check Lamp will
then flash ON and OFF and #1 position Tempera-
ture Indicator will remain illuminated. The test
sequence can be operated automatically or
manually. For AUTO step sequence, press the
AUTO/GAS Mode Selector Switch to the DOWN
position. The AUTO Mode Indicator will illuminate.
If each lamp illuminates during the check, the display
circuit board is good.
In automatic test mode, each load is activated for
approximately four (4) seconds then released.
The control system will automatically exit the
diagnostic sequence in approximately four (4)
minutes or when power is turned OFF.
The Temperature Indicator Lamps are used to
indicate which part of the control system is being
tested. When position #1 is illuminated, the
control is in an idle position with all output loads
off. To activate the first load simply push the
Temperature Selector Switch.
All of the checks listed below are done on the lower
circuit board.
The manual test sequence is as follows:
Position #1: Idle Position, all loads off.
Position #2: Activate AC Heater. Check for AC volts
at terminals J7 and J8.
Position #3: Activate Gas Solenoid. Check for DC
volts at Gas Solenoid white wire (-) and
yellow wire (+).
Position #4: Idle position. All loads OFF.
Position #5: Activate spark ignition system. Check
for DC volts to (+) terminal of igniter
and ground.
If you experience a problem on any of the above
checks, verify the fuses on the lower circuit board
are good.
If all checks prove to be good, and the refrigera-
tor does not operate on electric mode, replace
the lower circuit board. It has been damaged by
AC volts in excess of 180 volts.
5.9 LOWER CIRCUIT BOARD
RM7030 (Product No. 921890201 & 921890301)
The circuit board controls all modes of operation.
A. DC VOLTS
THESE PROCEDURES MUST BE FOLLOWED IN
SEQUENCE AND AT THE PROPER TERMINALS OR
DAMAGE TO THE BOARD WILL RESULT.
Before any checks are to be done, be
sure proper DC volts are to the board.
Measure volts between yellow terminal
on the 6-pin connector (positive [+] lead
from meter) to green terminal on 6-pin
connector (negative [] lead from
meter). Voltage should be the same as
at the positive (+) and negative ()
terminal block. If not, check the fuse and wiring.
With main ON/OFF switch on display panel in ON
position:
Check for DC volts between terminal 3 (red wire), ()
negative and terminal 5 (green wire) and terminal 1
(black wire). If there is no voltage, the ON/OFF
switch on upper circuit board is defective. Replace
the upper circuit board. If voltage is present, the ON/
OFF switch is good.
Next, do the same voltage test at the lower circuit
board. Negative () plug 1, terminal 5 (red wire), to
plug 1, terminal 1 (green wire) and plug 1, terminal 3
(black wire). If there is no voltage and you had
voltage on previous test, the cable assembly is
defective and you must replace it. If voltage is
present, the ON/OFF switch on the upper circuit
board and cable assembly is good.
YELLOW GREEN
6
PIN

16
DOMETIC® RM7030/RM7732
Refrigerators DIAGNOSTIC SERVICE MANUAL
C. GAS OPERATION
THESE PROCEDURES MUST BE FOLLOWED IN
SEQUENCE AND AT THE PROPER TERMINALS OR
DAMAGE TO THE BOARD WILL RESULT.
Before you check the circuit board for gas operation,
verify these components are good:
Igniter (Sec 5.5A) High Voltage Cable(Sec. 5.6A)
Electrode (Sec. 5.11) Solenoid (Sec. 5.4A)
Upper Circuit Board(Sec. 5.8A to 5.8I)
Thermostat (Sec. 5.1)
Also be sure NO voltage is present at the
IGN lock terminal, and delay mode is not
activated. First, check that voltage in
excess of 10.5 volts is between the yellow
terminal on the 6-pin connector (positive
[+] lead from meter) to the ground strip
(negative [] lead from meter). If less than
10.5 volts, correct wiring and/or power
source problem.
Next, check for the pulse voltage from the igniter at
the orange terminal on the 6-pin connector (negative
[] lead from meter) and the ground strip (positive [+]
lead from meter). If there is no signal voltage, check
the igniter (see Sec. 5.5A) and the orange wire and
connections. If signal voltage is present, next check
YELLO W
6
Pin
ORANGE
6
Pin
for voltage on the solenoid wires at the
circuit board. Positive lead from meter to
the gray wire and negative lead from the
meter to the black wire. If voltage is 9.5
volts or more, the circuit board is good. Do
not replace. If no voltage is present, replace
the circuit board.
D. DC VOLTS TO UPPER CIRCUIT BOARD
THESE PROCEDURES MUST BE FOLLOWED IN
SEQUENCE AND AT THE PROPER TERMINALS OR
DAMAGE TO THE BOARD WILL RESULT.
This check is to determine if the
lower circuit board is providing
voltage to the upper circuit board.
Measure between the brown
terminal on the 10-pin connector
(positive [+] lead from meter) to
the blue terminal on the 7-pin
connector (negative [] lead from
meter). A voltage reading indi-
cates the circuit board is good. If
no voltage is present, replace the circuit board.
NOTE: Before changing the circuit board, be sure all
troubleshooting steps have been followed.
BROWNBLUE
10 Pin7 Pin
RM7030 (Product No. 921890401) & RM7732
E. DC VOLT: ALL TESTS ARE TO BE DONE WITH
THE REFRIGERATOR IN THE COOLING MODE.
Before any checks are made, make sure the board
is receiving proper DC volts. Measure volts between
terminal J4 and the ground strip. Voltage should be
the same as at the positive (+) and negative (-) on
the terminal block. If not, check for loose connec-
tions.
F. AC MODE: NOTE: The PAL tester will allow for
proper testing of the integrity of the upper and lower
circuit boards. PAL is available from your Dometic
parts distributor.
ALL TESTS ARE TO BE DONE WITH THE REFRIG-
ERATOR IN THE COOLING MODE.
For AC heating element operation, check that
incoming AC voltage is present at terminals J5 and
J6 on the circuit board. If voltage is below 100 volts,
see Sec. 2.
B. AC OPERATION
THESE PROCEDURES MUST BE FOLLOWED IN
SEQUENCE AND AT THE PROPER TERMINALS
OR DAMAGE TO THE BOARD WILL RESULT.
For AC heating element operation, check that voltage is
present between the large black and large white wire at
the circuit board. If voltage is below 100 volts, the circuit
board will select another mode. If voltage is above 100
volts, check that AC volts are present at the heating
element connection. If no voltage is present, change the
circuit board.
NOTE: Before installing a new circuit board, correct the
cause of the failure, most likely it is the heating ele-
ments or wiring.
If voltage is present, DO NOT CHANGE THE CIRCUIT
BOARD. Check the following components: heating
elements, upper circuit board, thermostat and wiring.

17
DIAGNOSTIC SERVICE MANUAL DOMETIC® RM7030/RM7732
Refrigerators
Check for voltage at the heating element connection
terminals J7 and J8 on the circuit board. If no
voltage is present, check the 5 amp AC and 3 amp
DC fuses. If fuse is defective, replace the fuse. If
fuses are good, replace the circuit board.
G. GAS MODE: NOTE: The PAL tester will allow for
proper testing of the integrity of the upper and lower
circuit boards. PAL is available from your Dometic
parts distributor.
ALL TESTS ARE TO BE DONE WITH THE REFRIG-
ERATOR IN THE COOLING MODE.
Before checking the circuit board for gas operation,
verify that the following components are good: Upper
Circuit Board, Thermistor and 3 Amp Fuse.
NOTE: Each of the following tests should be
done according to pin locations. The wire colors
may vary.
First, check for voltage duringtrial-for-ignition
(approximately 45 seconds) at Plug 3, Terminals 1
(white wire) and 2 (yellow wire) to the solenoid. If no
voltage is present, change the circuit board. If
voltage is present, check for voltage at the solenoid.
If voltage is not present, check the wires and con-
nections.
Next, check for voltage to the igniter. If no voltage is
present, check the wires. If good, then change the
circuit board. If voltage is present, this portion of the
board is good.
NOTE: When millivolts to the lower circuit board are
10 ± 3, the power to Plug 3, Terminal 4 (blue wire)
will be shut off. If flame extinguishes during the
cooling mode, the circuit board will not supply
voltage to Plug 3, Terminal 4 (blue wire) again until
the millivolts have decreased to 10±3. This process
could take up to 15 seconds or longer.
To check the flame sense circuit of the lower circuit
board, operate the refrigerator on GAS mode, then
measure the millivolts between J3 terminal and the
other wire connection from the thermocouple. The
millivolt meter should read between 25 to 35 milli-
volts with the gas flame burning. Next, turn the
manual shutoff valve to OFF and watch the millivolt
reading as it drops. Note the millivolt reading when
Plug 3, terminal 4 (blue wire) receives power. It
should be 10±3 millivolts or 7 to 13.
Repeat this test several times. If the igniter fails to
spark on any test sequence, it should be replaced.
If the millivolt readings vary more than 1 to 2 MV
from one test to the other when power is supplied to
Plug 3, terminal 4, replace the lower circuit board.
NOTE: Verify all connections are clean and tight
before replacing either component.
5.10 DOOR SWITCH
The door switch is an open switch when the switch arm
is depressed (interior light should be off). When the
refrigerator door is open the switch is closed (interior
light should be on). Check that the switch assembly is
properly aligned and that it is not broken. Check the
switch assembly for continuity.
NOTE: To do a continuity check, first be sure all power
is disconnected or OFF to the refrigerator. Second,
remove all wires from the switch assembly, then check
the switch. After the check, be sure the switch assem-
bly is wired properly per the wiring diagram.
When the switch arm is depressed, there should not be
continuity. When the switch arm is NOT depressed,
there should be continuity. If any of these checks are
incorrect, replace the switch.
P1
P2
P3
J1 J2 J3 J4 J5 J6 J7 J8 J10
3 AMP FUSE
FIVE
AMP
FUSE
Black 3
Open 2
Green 1
6 Brown
5 Red Open 3
Blue 4 1 Whit
e
1 Whit
e
2 Yellow
4 Orange
or White
4 Orange
or White