Dometic RM1350 Elite User manual

ELITE 2 + 2 REFRIGERATOR
RM1350 & RME1350
USA
SERVICE OFFICE
Dometic, LLC
2320 Industrial Parkway
Elkhart, IN 46516
574-294-2511
CANADA
Dometic, LLC
46 Zatonski, Unit 3
Brantford, Ontario
CANADA N3T 5L8
519-720-9578
Form No. 3312238.000 01/09
©2006-2008 Dometic LLC
LaGrange, IN 46761
DIAGNOSTIC SERVICE MANUAL

1
SAFETY INSTRUCTIONS
This manual has safety information and instruc-
tions to help users eliminate or reduce the risk
of accidents and injuries.
RECOGNIZE SAFETY INFORMATION
This is the safety-alert symbol. When you see this
symbol in this manual, be alert to the potential
for personal injury.
Follow recommended precautions and safe op-
erating instructions.
UNDERSTAND SIGNAL WORDS
A signal word, WARNING OR CAUTION is used
with the safety-alert symbol. They give the level
of risk for potential injury.
Indicates a potentially hazard-
ous situation which, if not avoided, could result
in death or serious injury.
Indicates a potentially hazard-
ous situation which, if not avoided may result in
minor or moderate injury.
When used without the safety
alert symbol indicates, a potentially hazardous
situation which, if not avoided may result in prop-
erty damage.
Read and follow all safety information and in-
structions.
Foreword
This service manual is the result of the dedica-
tion of Dometic Corporation technical staff and
its engineers in giving service people the nec-
essary instruction for making accurate analyses
of certain conditions. Provided is a diagnostic
chart leading a qualied mechanic into the ser-
vice manual pages to locate and solve symp-
toms which may occur. Dometic has continued
its commitment in providing service people with
this, the most up-to-date information about ser-
vicing Dometic RV accessories.

2
PAGE NO.
DIAGNOSTIC FLOW CHART.............................................................................4
CONTENTS
SECTION 1
OPERATION
Refrigerator Overview & Operation ........... ............................................6
SECTION 2
AC VOLTAGE
AC Voltage Requirements................ ....................................................16
SECTION 3
AC COMPONENTS
3.1 Heating Element ............................................................................16
3.2 AC Icemaker Water valve ...............................................................16
3.2 Control Module Water Valve & Auger .............................................17
3.4 Auger ..............................................................................................17
SECTION 4
DC VOLTAGE
DC Voltage Requirements ............... ........................................................18
SECTION 5
DC COMPONENTS
5.1 Thermistor ............................ .....................................................19
5.2 Solenoid Valve.................................... .......................................19
5.3 Igniter ........................ ................................................................19
5.4 High Voltage Cable ................................. ..................................20
5.5 Electrode ....................................................................................20
5.6 Climate Control Heater...............................................................20
5.7 Thermofuse ................................................................................20
5.8 Door Switches ....................... ....................................................21
5.9 Control Panel ....................... .....................................................21
5.10 LED Display Panel ......................... ...........................................21
5.11 Flap Heater Wire ........................................................................21
5.12 Lower Board ..............................................................................22
5.13 Fuses ............... .........................................................................23
5.14 DC Water Dispenser Valve.........................................................23
5.15 Automatic Door Lock..................................................................24
5.16 DC Relay....................................................................................24
5.17 Ventilator Fans ...........................................................................24
SECTION 6
Wiring
6.1 Internal Wiring ................... ........................................................24
6.2 External Wiring...........................................................................30

3
SECTION 10
ERROR CODES
10.1 Codes ..................................................................................................40
SECTION 11
DIAGNOSTIC MODE
11.1 Diagnostic Test ..................................................................................40
SECTION 12
ICE MAKER
12.1 Operation............................................................................................41
12.2 Mold Heater........................... .............................................................41
12.3 Ice Ejector...........................................................................................41
12.4 Mold Thermostat.................................................................................41
12.5 Shut Off Arm................... ....................................................................42
12.6 Mold Switches........................... .........................................................42
12.7 Timing Motor........................... ............................................................42
12.8 Water Valve ........................................................................................42
12.9 Ice Maker Replacement......................................................................43
12.10 Water Fill Adjustment..........................................................................43
12.11 Water Supply.......................................................................................43
12.12 Wiring Schematics .............................................................................43
PAGE NO.
CONTENTS
SECTION 7
LP GAS REQUIREMENTS.........................................................................30
SECTION 8
GAS COMPONENTS
8.1 Manual Gas Shutoff Valve......................... ............................................30
8.2 Orice ...................................................................................................31
8.3 Thermocouple........................................................................................31
8.4 Burner ...................................................................................................32
8.5 Flue Bafe .............................................................................................32
8.6 Flue Tube...............................................................................................32
SECTION 9
COOLING UNIT
9.1 Leveling......................... ........................................................................33
9.2 Ventilation ..............................................................................................33
9.3 Air Leaks................................................................................................37
9.4 Interior Liner Seal to Frame...................................................................37
9.5 Door Position.........................................................................................38
9.6 Ambient Temperature ............................................................................38
9.7 Cooling Unit...........................................................................................38
9.8 Food Storage.........................................................................................38
9.9 High Humidity ........................................................................................38

4
Symptom Cause Section & Page
1. No operation - no panel lights Operation
DC Volts
Fuse
Wiring
Control Panel
LED Display Board
Lower Circuit Board
1, Page 13
4, Page 18
5, Page 23
5, Page 21 & 6, page 30
5, Page 21
5, Page 21
5, Page 22
2. No operation - has panel lights Operation
DC Volts
Thermistor
Wiring
Lower Circuit Board
1, Page 13
4, Page 18
5, Page 19
5, Page 21 & 6, page 30
5, Page 22
3. No AC operation - operates on gas mode Operation
AC Volts
Fuse
Heating Element
Wiring
Lower Circuit Board
1, Page 13
2, Page 16
5, Page 23
3, Page 16
5, Page 21 & 6, Page 30
5, Page 22
4. No Gas operation - operates on AC mode Operation
LP Gas
Manual Gas Valve
Igniter
High Voltage Cable
Electrode
Solenoid
Wiring
Lower Circuit Board
1, Page 13
7, Page 30
8, Page 30
5, Page 20
5, Page 20
5, Page 20
5, Page 19
5, Page 21 & 6, Page 30
5, Page 13
5. Insufcient cooling on all modes. Ventilation
Leveling
Ambient Temperature
Air Leaks
Thermistor
Cooling Unit
9, page 33
9, page 33
9, page 38
9, page 37
5, page 19
9, page 38
6. Insufcient cooling on AC - cools properly on gas mode. AC Volts
Heating Element
Lower Circuit Board
2, page 16
3, page 16
5, page 22
7. Insufcient cooling on Gas - cools properly on AC mode. LP Gas
Orice
Flue Bafe
Flue Tube
Burner
Lower Circuit Board
7, page 30
8, page 31
8, page 32
8, page 32
8, page 32
5, page 22
This program will address the most common system problems associated with the RM1350 refrigerator supplied by Do-
metic LLC. Our intent is to provide you with a guideline of checks to make, should you encounter one of the following
symptoms.

5
Symptom Cause Section & Page
8. Freezes. Thermistor
Lower Circuit Board
DC Volts
5, Page 19
5, Page 22
4, Page 18
9. Check LP ashing DC Volts
Wiring
LP Gas
Manual Gas Valve
Solenoid
Orice
Burner
Thermocouple
Lower Circuit Board
4, page 18
5, page 21 & 6, page 30
7, page 30
8, page 30
5. page 19
8. page 31
8. page 32
8. page 31
5. page 22
10. Interior light on when door is closed Wiring
Door Switch
Door Position
5. page 21 & 6, page 30
5. page 21
8. page 21
11. Rapid formation of frost Food Storage
Interior Liner to Frame
High Humidity
Air Leaks
8. page 21
8. page 20
8. page 21
8. page 20
12. Water on frame Interior Liner to Frame
High Humidity
Air Leaks
Climate Control Heater
8. page 20
8. page 21
8. page 20
5. page 20
13. Intermittent warming up of fridge Automatic C/U cycling system 1. page 12

6
SECTION 1
1.1 Refrigerator Overview
LED Display
Control Panel
Manual Travel Latch
Finned Cooling Plate
Drip Protection
Draining Pipe
Crispers
Shelf
Door Compartment
Ice Bucket
This is a general view of the appliance. The Model shown is equipped with ice maker. The
number of shelves and door compartments may
vary according to the model.
MODELS WITH MANUAL DOOR LOCKING SYSTEMS

7
SECTION 1
LED Display
Control Panel
AutomaticTravel Latch
Water Dispenser
not on all units
Finned Cooling Plate
Drip Protection
Draining Pipe
Crispers
Shelf
Door Compartment
Ice Bucket
This is a general view of the appliance. The Model shown is equipped with ice maker
and water dispenser. The number of shelves and door compartments may
vary according to the model.
MODELS WITH THE AUTOMATIC DOOR LOCKING SYSTEM
AND EQUIPPED WITH WATER DISPENSER

8
LED Display
Control Panel
Finned Cooling Plate
Drip Protection
Draining Pipe
Crispers
Shelf
Door Compartment
This is a general view of the appliance. The number of shelves and door compartments may
vary according to model.
AutomaticTravel Latch
MODELS WITH THE AUTOMATIC DOOR LOCKING SYSTEM AND
EQUIPPED WITH ICE AND WATER DISPENCER
Ice Box
Drip Tray top
of lower door
SECTION 1

9
DISPLAY PANEL RM1350 & RME1350
Refrigerator Control Panels
1. Main Power Button ON/OFF
Press the button to turn the refrigerator on or off.
2. AUTO/GAS Mode Selector Button
Press the button to turn the auto mode on or off.
3. TEMP. SET Button
The thermostat has 5 settings where 1 indicates the
warmest and 5 the coldest temperature setting. Press
the button repeatedly until the desired setting, e.g. 3,
is shown in LED display. This value is shown for about
5 seconds and then the temperature is displayed
again, e.g. 43.
RM1350 Display
RME1350 Display

10
RM1350M,RM1350IM
& RM1350WID
RME1350WIM
Fresh food temperature
Thermostat range setting indication (1-5). Temporary during set-
ting. The thermostat settings are stored automatically after 5 sec.
of inactivity
60 is displayed. Indicates that the temperature is above measure-
ment range
---- AUTO mode is lit. Indicates AUTO mode and AC operation
---- AUTO and LP mode lamps are lit. Indicates AUTO mode and GAS
operation
---- LP mode lamp is lit. Indicates manual gas operation mode
---- LP is ashing (message alternates between LP and the tempera-
ture). Indicates gas operation lockout. Check gas
---- AUTO mode lamp is lit and LP mode lamp is ashing. Indicates
temporary gas operation lockout
LED Display Panel
The LED display panel provides a quick visual indicator of the temperature of the food in the fresh food cabinet, status
messages, and alarm conditions. For RM1350XXX, the AUTO and LP mode indication lamps show the mode of operation.
LED PANEL INDICATIONS STATUS INFORMATION

11
The refrigerator is equipped with a travel latch that auto-
matically locks the refrigerators doors when the RVs en-
gine is running. When the RV’s engine is off, the travel
latch unlocks the doors.
Manually Unlock
Shutter
To open one of the refrigerator doors while the engine is
running, the travel latch must be manually unlocked. To
unlock, simply push the shutter to the left. The doors will
automatically lock again after 5 seconds.
Note: If the Refrigerator Has Been Turned Off
When the engine is turned on, a signal through the alter-
nator, (D+) activates the travel latch, which in turn locks
the refrigerator doors. When turning off the engine, the
doors will not open automatically as usual because the
refrigerator is turned off. In order to switch on the refrig-
erator, the doors must be manually unlocked.
Models With Automatic Door Locking
System
Models With The Manual Door Locking
System
The refrigerator is equipped with a manual locking
system. The doors are automatically locked when closed.
To unlock, simply open the doors as usual.
Airing Position
When the refrigerator is turned off for a period of time it
is recommended that the refrigerator is emptied, defrost-
ed, cleaned and that the doors are left ajar and leveled.
To ensure the doors stay ajar, use the automatic travel
latch’s airing position function.
1. Open the refrigerator doors. Slide the shutter to the
right. The automatic travel latch is locked.
2. Gently close the doors (A) until the pins click into posi-
tion (B).
Pin
3. Verify that a small spacing has been created between
the cabinet and the doors and that the doors have not
been closed completely. If so, unlock the latch and close
the doors again.
4. In order to open the doors again the travel latch must
be unlocked. Push (to close the doors completely) and
then slide the shutter to the left to unlock the latch.
Airing Position
When the refrigerator is
turned off for a period of
time it is recommended that
the refrigerator is emptied,
defrosted,cleaned and
that the doors are left
ajar and leveled. Use the
detachable airing position
device to ensure the doors
stay ajar.
1. Open the door and slide
the device in place.
2. Close the refrigerator
doors. These will immedi-
ately hook to the front edge
of the airing position device
creating a small spacing
between the cabinet and
the doors.
3. To detach, open the doors and slide the device upward.
Remove and keep in a safe place. Close the doors.

12
AUTOMATIC ENERGY SELECTOR CONTROL
SYSTEM
The refrigerator is equipped with an automatic energy se-
lector control system. The user turns the refrigerator on,
selects the desired temperature, and then the refrigera-
tor automatically selects the most suitable energy source
available (either 120 VAC or LP gas operation). The sys-
tem can be set by the user to be fully automatic (AUTO
mode is selected) or to operate on LP gas only (AUTO
mode is off). The refrigerator controls will work down to
9.6 volt DC.
Most LP gas appliances used in recreation-
al vehicles 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 appliance and ignite
from the burner ame, CAUSING A FIRE OR
AN EXPLOSION.
FOR YOUR SAFETY, when refueling, shut
off all LP gas appliances which are vented
to the outside.
Low Ambient Control
The automatic Low Ambient Control (LAC) ensures trou-
ble free operation in low ambient temperatures (e.g. be-
low 50° F). In colder weather, the temperature inside the
absorption refrigerator food storage compartment box
tends to hold the temperature inside for a very long pe-
riod of time. With very long periods in between ON/OFF
cycling of the heat source; this is OK for any food product
inside the refrigerator cabinet, but is not OK for the freez-
er compartment (if it happens to have perishable prod-
uct inside). Because of the long time in between cycling
ON/OFF, there is a chance that the temperature may rise
above freezing in the freezer compartment, resulting in
food spoilage.
This is why we have a low ambient control. If it so hap-
pens that the temperature in the refrigerator has satised
the thermostat setting, and the CUT-OUT threshold has
been reached, the refrigerator cycles OFF. If the tempera-
ture remains at lower than the CUT-IN threshold for 35
minutes or longer, the LAC output will be activated; this
output is typically, connected to the interior lamp situated
inside the refrigerator compartment. The warmth gener-
ated by the lamp slowly raises the temperature inside the
refrigerator cabinet to the CUT-IN threshold; when CUT-
IN is achieved, the refrigerator cycles back ON again. At
this point, the LAC output is de-activated, and the interior
lamp turns OFF. The refrigerator will now assume normal
operation, and will continue to cool until thermostat is sat-
ised once more. If it should so happen that CUT-IN is
not achieved again within 35 minutes, the LAC process
will be initiated once more (and any time thereafter) as
required.
In an absorption refrigerator system, ammonia is liqueed
in the nned condenser coil at the top rear of the refrig-
erator. The liquid ammonia then ows into the evaporator
(inside the freezer section) and is exposed to a circulat-
ing ow of hydrogen gas, which causes the ammonia to
evaporate, creating a cold condition in the freezer. When
starting this refrigerator for the very rst time, the cool-
ing cycle may require up to four hours of running time
before the cooling unit is fully operational. The tubing in
the evaporator section is specically sloped to provide a
continuous movement of liquid ammonia, owing down-
ward by gravity through this section. Sodium chromate is
used for corrosion protection (less than 2 % weight of the
coolant).
LEVELING THE REFRIGERATOR
ABSORPTION COOLING SYSTEM
Automatic Cooling Unit Cycling System
The refrigerator has been designed with an automatic
cooling unit cycling system that helps reduce frost build
up in the fresh food compartment. The rst automatic frost
reduction cooling unit cycle begins 60 hours after turning
“on” the refrigerator (for best operational results the re-
frigerator should be turned on anytime between 4 and 10
PM), and will last for approximately 120 minutes. Thereaf-
ter, the cycle will automatically repeat every 48 hours for
as long as the refrigerator continues to run.
Leveling is one of the requirements for proper operation
with absorption refrigerators. To ensure proper leveling
the vehicle needs to be leveled only so it is comfortable
to live in (no noticeable sloping of oor or walls).Any time
the vehicle is parked for several hours with the refrigera-
tor operating, the vehicle should be leveled to prevent this
loss of cooling. If the refrigerator is operated when it is
not level and the vehicle is not moving, liquid ammonia
will accumulate in sections of the evaporator tubing. This
will slow the circulation of hydrogen and ammonia gas, or
in severe cases, completely block it, resulting in a loss of
cooling. When the vehicle is moving, the leveling is not
critical, as the rolling and pitching movement of the ve-
hicle will pass the liquid to either side of level, keeping
the liquid ammonia from accumulating in the evaporator
tubing. Leveled at all times - even in storage.

13
NOTE: Do not continue to reset GAS operation if the LP
is ashing in the display after several tries. LP ashing
(message alternates between LP and the temperature)
indicates gas operation lockout (Flame Failure).
MODES OF OPERATION - AUTO AND GAS
AUTO MODE
When the refrigerator is in AUTO mode, it automatically
uses the most efcient energy source that is available
for operation. Should a more efcient energy source be-
come available during operation, the refrigerator controls
change from the current energy source to the more ef-
cient energy source as follows:
1. AC operation (if 120V AC is available). AC operation
is only possible in AUTO mode.
2. GAS operation (if 120V AC is not available).
Before starting the refrigerator:
• Check that all manual gas valves are in the on posi
tion.
• Make sure that a continuous 12V DC supply is avail
able for the electronic control to function.
To start the refrigerator:
1. Press the ON/OFF button.
2. Select operation mode:
• AUTO mode ( AC and GAS )
Press the AUTO/GAS mode selector button
( if not already on ).
• GAS mode ( gas operation only ).
PresstheAUTO/GASmodeselectorbuttontoturnoff
the AUTO mode (if not already off).
GAS MODE (manual LP gas operation)
When AUTO mode is turned off, the refrigerator uses
GAS as energy source - even if AC is available.
Startup
The thermostat has 5 settings where 1 indicates the warm-
est and 5 the coldest temperature setting. Press the but-
ton repeatedly until the desired setting, e.g. 3, is shown in
the LED display. This value is shown for about 5 seconds
and then the temperature is displayed once again.
Adjusting The Thermostat
Turning Off The Refrigerator
The refrigerator may be shut off while in any mode of op-
eration by pressing the main power ON/OFF button (OFF
position). This shuts off all DC power to the refrigerator,
including the interior light. If the refrigerator will not be in
operation for a period of weeks, it should be emptied, de-
frosted, cleaned and the doors left ajar and leveled.
Description Of Operating Modes
Auto Mode
When operating in the AUTO mode, the AUTO mode indi-
cator dot is lit. The control system will automatically select
between AC and GAS operation with AC having priority
over GAS. If the control system is operating with AC en-
ergy and it then becomes unavailable, the system will au-
tomatically switch to GAS. As soon as AC becomes avail-
able, the control will switch back to AC operation again.
Gas operation (when 120 volts AC is not available). The
control system will activate the ignition system and will
make three attempts to light the burner for a period of
approximately 45 seconds with two minutes rest (purge)
interval. If unsuccessful, LP will be ashing (the message
alternates between LP and the temperature) in the dis-
play. To restart an ignition attempt with LP ashing in the
display: turn unit off wait a few seconds and turn back on.
The control system will attempt a new ignition sequence.
If 120 volts AC becomes available while LP is ashing, the
refrigerator will operate on AC but the LP ashing will not
turn off until the main power ON/OFF button is pressed to
the OFF then ON position.
1.2 Refrigerator Operation
Before starting the refrigerator, check that all the manual
gas valves are in the ON position. DO NOT forget the
manual shutoff valve on the rear of the refrigerator. This
refrigerator is equipped with a control system, which can
be set to automatically select either 120 volt AC or LP gas
operation (AUTO mode), or if desired LP gas only (GAS
mode).
When operating in the GAS mode, the AUTO indication dot
is off and the LP indication dot is lit. This mode provides
LP gas operation only. The control system will activate the
ignition system and will make three attempts to light the
burner for a period of approximately 45 seconds with two
minute (purge) intervals after each trial. If unsuccessful,
the display will ash LP. To restart GAS operation, press
the main power ON/OFF button to the OFF and then ON
position. The control system will attempt a new ignition
sequence. If the refrigerator has not been used for a long
time or the LP tanks have just been relled, air may be
trapped in the supply lines. Purging the air from the lines
may require resetting the main power ON/OFF button
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 the manual shutoff valves in the
lines are turned on.
Gas Mode

14
Temporary Gas Lockout
In the Auto mode the gas operation will automatically be
locked out for a period of 15 minutes when the engine is
switched off (D+ terminal). This will prevent gas operation
e.g. when stopping at a refueling station. Note that the
temporary gas lockout feature does not work when the
AUTO mode is turned off! Consequently, when parking
close to a gasoline pump all LP gas appliances vented to
the outside of the vehicle must be turned off. Otherwise
gasoline fumes from gasoline pumps might enter LP gas
appliance and these can then ignite from the burner ame
and cause a re or an explosion.
1.3 Ice Maker Operation
Before the ice maker can operate, make sure that:
- the refrigerator is cooled down.
- the refrigerator/icemaker is connected to 120 V AC.
- the water valve supplying the refrigerator is turned
on.
- the ice level bail arm is in its fully down position.
Water Supply
The water supply system must have a minimum/maximum
pressure of 15/50 pounds per square inch gauge (psig). A
1/4” diameter water line to the water valve should be used
at the rear of the refrigerator. The water line must have a
manual shutoff valve placed where it is easily accessible.
Adjusting The Size Of Cubes
If the ice maker was cleaned and drained, no ice cubes
will be dumped into the bin during the rst cycle. The rst
few cycles may have small cubes due to air trapped in
the water lines. The rst container of ice cubes should
be dumped if the water system has been winterized or
has not used for several weeks. Once the ice maker has
run through several cycles and if cubes are too small or
sticking together, adjustment is necessary to the amount
of water entering the mold. The maximum water level is
represented by a thin line. It is essential that the water
level does not exceed this line!
When the ice maker thermostat senses the preset tem-
perature for the ejection of the ice cubes, the ngers will
start to rotate, dumping any ice cubes and lling the mold
with water. When the storage container is full, the bail arm
will come in contact with the ice cubes. The bail arm can-
not return to the full down position and the ice produc-
tion is stopped until the bin is emptied or the ice cubes
are removed. To prevent water from splashing out of the
mold assembly when your recreational vehicle is moving,
raise the bail arm to the full “UP/OFF” position about 1-1/2
hours before departing. This will allow the water in the
mold to freeze.
Remove the protective cover from the ice maker
mechanism. Using a at-head screwdriver, place the tip
of the screwdriver in the slot. Twist the screwdriver blade
gently to loosen the cover.
Locate the adjusting screw under the protective cover.
Turn the screw counterclockwise to increase the size
of the cubes. Turn the screw clockwise to decrease the
cube size, if the mold is over lling or the cubes are stuck
together.

15
Water Dispenser
Verify that the water valve supplying the refrigerator is
turned on. To dispense water at the door, simply press the
lever. This will activate a switch which turns on an electric
water valve at the back of the refrigerator. Water will ow
through a separate tube and out of the dispenser. To keep
the water fresh, it is recommended to use the dispenser
every day. If new installation, or used infrequently, dis-
pense numerous glasses of water before use.
Ice & Water Dispenser
Do not turn the adjustment screw more than one revolution
at a time. Allow the ice maker to cycle several times
before another adjustment is made. Be sure to replace the
protective cover on the ice maker after the adjustments
are complete.
TO DISPENSE ICE, FOLLOW THESE STEPS:
Insert a glass in the dispensing cavity and press the
left lever.
1.
The ice maker has previously produced ice that is
stored in a large bin. When the lever is pressed, a
switch is activated. It turns on a motor which rotates
the auger. When the auger rotates, it pushes ice out of
the bin, through a chute and into the glass.
2.
To stop dispensing, pull glass away from dispensing
arm before the glass is full.
3.

16
SECTION 3 AC COMPONENTS
3.1Heating Elements
The heating element is designed to deliver a predeter-
mined amount of heat to the cooling unit. To check a heat-
ing 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 element at room tem-
perature. You should obtain the following readings ± 10%:
Model Watts Ohms Amps
RM1350 420 34.3 3.5
Note: Never over or under size the AC heater.
This is an energized circuit. Shock can occur
if not tested properly. Testing is to be done
by a qualied service technician.
SECTION 2 AC VOLTAGE
AC VOLTAGE REQUIREMENTS
The refrigerator is a 120 volt AC, 60 Hz appliance. The
proper operating range is 100 to 132 volts. If voltage
drops below 100 volts, cooling efciency will decrease
relative to voltage decrease. 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.
120 Volt
Receptacles
May have seper-
ate power cords if
unit has Ice Maker
The refrigerator is equipped with a three-prong (ground-
ing) plug for your protection against shock hazards and
should be plugged directly into a properly grounded three
prong receptacle. Do not cut or remove the ground-
ing prong from this plug! The free length of the cord
is 3 feet. It is recommended that the receptacle is locat-
ed to the right side of the refrigerator (viewed from the
rear). The receptacle should be 3” (from the bottom of the
plastic receptacle) above the refrigerator mounting oor.
This allows easy access through the vent door. The cord
should be routed to avoid direct contact with components
that could damage the cord insulation. The refrigerator
will not switch to another mode of operation until all AC
power is lost.
The RM1350 uses two AC heaters wired in series. The
ohms resistance should be 34.3 ohms +/- 10%.
This valve is solenoid operated. When it is open it
releases water from the source to the mold. The amount
of water is proportional to the length of time the water
valve switch is held closed by the timing cam. Disconnect
power to the appliance, remove the wires to the water
valve solenoid coil, and check for continuity between the
two terminals. The ohms reading should be 200 +/- 10%.
If you have continuity, the solenoid is good. It takes 10-
15 watts to energize the solenoid coil. The mold heater
and coil are in series. When the mold heater is activated,
this causes the voltage to drop to about 105 VAC at the
coil. The valve has a ow washer inside which acts as a
pressure regulator. A strainer is installed to prevent dirt,
rust, etc from entering the valve. Check for any debris
which might obstruct the ow of water or prevent the valve
from closing completely when the circuit is not energized.
Remove any obstructions. If the valve still fails to operate
properly, replace it. If the valve has been cracked from
freezing this would not be a warrantable item.
3.2 AC Icemaker Water Valve
12 Volt Valve
Water in Door
120 Volt Valve
Icemaker

17
3.3 Control Module for Water & Auger
The control module is used for two reasons:
To shut off the 120 volt AC & 12 volt DC supply to
the door dispenser and icemaker auger when the
freezer door is opened (for safety reasons)
To shut off the 120 volt AC & 12 volt DC supply
to the door dispenser and ice maker when the
refrigerator is switched “OFF” by means of the ON/
OFF button on the upper display panel
•
•
The function of this additional module is very simple. It
has a fuse (5 amp) for incoming 120 volt AC line voltage
and a relay that switches the line voltage ON/OFF. The
relay is driven by a circuit that senses the voltage at the
node between the door switch and the interior lamp. This
relay is controlled by the wires in the P1 connector on
the interface module. These wires are hooked on the
wires coming from the power module to the lamp and
door switch. The black wire is ground (- virtual), the white
wire is 12 volt DC (+) and the yellow wire is going to the
connection point between the lamp and door switch. If the
door is opened, the yellow wire should be 12 volt DC (+)
and if the door is closed, the reading should be 0 volts
DC. If the lamp is lit or if 12 volt DC is absent, the relay
will drop out and 120 volt AC will not be supplied to the ice
maker auger or the door water dispenser.
Control module wiring diagram
Troubleshooting control module
Problem 1
The water paddle is pushed but nothing happens, the
LED light is off.
Action
1. Remove the front cover of the dispenser and check
that the paddle mechanism activates the tactile switch.
The switch can also be checked by pushing it with a n-
ger.
2. Remove the 2-pole Molex connector in the dispenser
and check the voltage. It should be slightly lower than the
battery voltage. If power is there, but still no fuction, re-
place front control unit.
3. Check the voltage on the copper tabs in the spring-
loaded connector on the hinge side of the door.
4. Check the voltage at the 2-pin connector on the back
control unit.
5. Check the system supply voltage at the 4-pin connec-
tor on the back control unit.
Problem 2
The water paddle is pushed but nothing happens, the
LED light is on.
Action
1. Check the heater connection in the dispenser. The
resistance of the heater should be 68 ohms +/- 10%.
2. Check the voltage on the water valve. If no voltage,
replace the back control unit. If still no function, replace
the front control unit.
Problem 3
The ice paddle is pushed but nothing happens, the LED
light is off.
Action
See actions for problem 1.
Problem 4
The ice paddle is pushed but nothing happens, the LED
light is on.
Action
1. Check the heater connection in the dispenser. The
resistance of the heater should be 68 ohms +/- 10%.
2. Check the 5 amp fuse in the back control unit.
3. If fuse is OK replace the back control unit. If still no
function replace front control unit.
Problem 5
The icemaker is not working
Action
1 Check the 5 amp fuse in the back control unit.
3.4 Auger
When the paddle on the door dispenser is depressed to
call for ice, a switch will be closed sending a signal to the
interface module to send AC voltage via the yellow wire.
This contact on the interface module is a bridged set of
terminals that internally send the AC voltage to the auger
motor. As the auger motor rotates, the auger pushes the
ice forward in the ice bin and down through a chute to
the door dispenser. To check the motor, disconnect the
120 volt AC supply to the interface module. Measure the
resistance between the wires on terminals (J6) and (J3)
of the interface module.

18
SECTION 4 DC VOLTAGE
Clean Direct Current (DC) power is mandatory for high-
tech circuits to operate as designed. A battery will provide
straight line DC power. The converter and alternator pro-
duce DC power by a series of diodes that rectify alternat-
ing current to DC. The Dometic control system will only
tolerate up to 6 AC volts on the DC line. AC ripple can be
measured by a digital voltmeter set on the AC and mea-
sure at the main DC terminal block connections. Six volts
AC or less is acceptable. If AC volts exceed 6 on the DC
incoming line, the power source should be cleaned up.
AC voltage in excess of 6 volts will affect the processor
and create erratic operation. When testing for AC ripple
on the DC line, always put a load on the converter. The
operational range of the unit is a minimum of 9.6 volt DC
to a maximum of 22 volts DC. The unit will automatically
shut down at 22 DC volts or greater, and come back on
when voltage has decreased to 18 volts DC. The refrig-
erator requires at least 9.6 volts DC for proper operation,
however the panel lights will continue to be illuminated
until voltage has dropped to 4 volts DC or below. Do not
use the body or chassis of the RV as a substitute for ei-
ther of the two conductors. The refrigerator must be con-
nected to the battery circuit with two wires of adequate
capacity to avoid voltage drop. Proper polarity is crucial
for refrigerator operation. No other electrical equipment
or lighting should be connected to the refrigerator circuit.
Just because you can read volts, does not mean you have
the amps to operate the control system. If relays buzz or
lights go dim or out during operation, this could indicate
there is a loose connection somewhere. As a last test, use
a battery and run wires directly to DC terminal block. If the
unit works ok on direct DC volts from a battery, the prob-
lem is in the coach not the refrigerator control system.
Grounds
The operation of the Dometic refrigerator is also depen-
dent on good, clean ground connections. Loose or corrod-
ed ground terminals create an unknown resistance factor
that can effect the voltage detected by the Power Module.
A loose negative DC wire will create a negative millivolt
signal that the control board will pick up and create erratic
operation. Check the integrity of the grounds from the re-
frigerator all the way to the power source/battery. Clean or
tighten any suspicious looking connections.
NOTE: The DC terminal block below the control boards
should be cleaned and tighten at all 6 wires.
Main Terminal Block
12 V DC Alternator (D+) Connection
The refrigerator requires a continuous 12 V DC supply to
maintain operation of the control system. Furthermore, for
models equipped with the automatic door lock, it requires
the connection of a signal wire from the alternator (D+) to
maintain the automatic door travel latch and the tempo-
rary gas lockout function. The vehicle’s alternator (D+) is
connected to D+ on the terminal block.
The resistance should be 4.0 Ohms +/- 10%. The resis-
tance can also be checked directly at the motor assembly.
This will require removal of the plate along the back wall
of the freezer just behind the ice bin.

19
SECTION 5 DC COMPONENTS
5.1 Thermistor
Disconnect the thermistor harness from the P2, 2-pin ter-
minal on the lower circuit board. Place the thermistor in
a glass of ice water (more ice than water), approximately
33° F to 35° F. Wait 8 to 10 minutes. You should get a
reading of approximately 8,000 to 10,000 ohms. Always
test from the wire side as shown below as not to create a
connection problem at the P2 connector.
NOTE: The RM1350 will not run constantly when the
thermistor is unplugged or becomes an open circuit, be-
cause the RM1350 has a water tank in the refrigerator
to provide chilled water for the dispenser. Failure of the
thermistor will cause the unit to stop cooling.
5.2 Solenoid
Check the solenoid coil with a properly calibrated Ohm
meter. Remove the connectors from the solenoid and
measure the resistance across the terminals and to chas-
sis ground. The proper reading would be 49 ohms with a
tolerance range of ten percent. Failure of the solenoid is
very unlikely.
Thermistor
unplugged
from PC board
5.3 Igniter
The igniter used on Dometic model refrigerators operates
on 12 volts DC. During gas operation the igniter senses
the resistance through the ame between the electrode
and burner. When there is no ame at the burner, the re-
sistance is high and the igniter begins sparking to light the
burner. As soon as the ame is lit, the resistance between
the electrode and burner drops and the igniter stops
sparking. The resistance is monitored by the igniter, and,
if for any reason the ame goes out, the igniter begins
sparking until the burner is lit. The resistance between the
electrode and burner drops and the igniter stops sparking.
This is an energized circuit. Shock can occur
if not tested properly. Testing is to be done
by a qualied service technician.
This insures that the ame will always be lit when de-
sired. First verify proper voltage at the positive (Yellow
+) and ground (Black –) terminals of the igniter. The read-
ing should be within 1.5 volts of incoming voltage at the
main terminal block during trial-for-ignition. Next, remove
the high voltage cable from the igniter. The igniter should
produce a sparking sound, during trial-for-ignition. If not,
replace the igniter. While operating in the gas mode, the
power module and igniter are constantly monitoring the
presence of ame. If the ame is blown out, the igniter
will immediately start sparking. When the power module
senses the loss of ame (thermocouple voltage below 13
MVDC), the 45 seconds trial for ignition period is started.
The igniter installed on the refrigerators as original equip-
ment is part number 2931132019 (RV Gas Model 679).
This igniter is rated 50 MA. This igniter may also be used
on any other model. When replacing the igniter, always
provide the product number for proper replacement. DO
NOT install the Channel Mark 6, Model 12 E igniter (as
shown) as a service replacement part. Installation of the
Channel Products, Inc., Gasliter Mark 6, Model 12 E, will
VOID the warranty on the refrigerator. The Dometic re-
frigerator could use a few different igniters. To acquire the
proper igniter always provide the product number from
the unit you are working on.
Next, hook up a manometer at the test port. Then check
for DC volts at gas valve terminals (Yellow + White -)
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 the unit is in trial-for-ignition,
verify that the wires at Plug 3, Terminals 2 and 1 (on lower
circuit board) have DC volts (9 or more). If the igniter is
sparking and you have no volts at the valve, check the
harness. The control board sends voltage to the solenoid
and the igniter on the same wire.