Thetford N3000 series Operating instructions

Service mode LED
1. To enter service mode, push 3
buttons simultaneously until
binary code is visible
2. Then calculate or read in the
table which error you see.
!!! Note : When supply voltage
12 VDC (low current voltage) is
not available, no error code will
be given. When 12 VDC is
available the green power LED
will be on. If battery pack is
empty you can see a red light !!!
Troubleshooting
N3000 -series
13
12
11
Readout Code
- LED Display
8
2
Error Code
No Error
Code
1
10
9
3
4
5
6
7

Service mode LCD
Troubleshooting
The error code will appear in the
display over here.
!!! Note : When supply voltage
12 VDC (low current voltage) is
not available, no error code will
be given. When 12 VDC is
available the green power LED
will be on !!!
N3000 -series

Error code 1: Senses flame when gas should be off
Check if the gas valve works Replace the gas valve
No
No
Yes
Turn the refrigerator off and on,
problem solved? Problem solved
Yes
No
Disconnect the 12VDC supply
and connect it again. Is the
problem solved?
Yes
Install error code 1 modification
kit. For Tab connector item:
690449, for Mate-N-lok connector
item:690799
Production date of the fridge?
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
Troubleshooting
N3000 -series
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 2: Burner control module returns
incorrect feedback.
Burner Control Module failure
Production date of the fridge?
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 3: Gas lockout because flame fails to
ignite within 30 sec.
Check if there is gas supply on
the fridge
Ensure gas
bottle is not
empty and all
gas valves are
open.
Check if there is a spark
Replace
electrode
Adjust the
electrode gap
to approx.
4mm
Check if the electrode gap is set
at about 4 mm above the burner
Check if electrode connections
& look for damages are ok
Turn refrigerator off and on and
check if there is a spark
No
Yes
Yes
Yes
No
NoNo
No
No
No
Yes
Yes
Yes
Check if electrode connections
are ok & look for damages
Troubleshooting
N3000 -series

Error code 3: Gas lockout because flame fails to
ignite within 30 sec.
Replace the
gas valve
Check if the
gas valve is
open
Check if injector of the burner
is clean and the flame is dense
and blue
Check if the gas pressure is
between 30 an 35 mb Check the gas
installation
Yes
Yes
No
Clean burner
and injector.
Replace the
burner in case
of bad
combustion
No
Yes
No
Yes
Repair connection or damage,
turn refrigerator off and on, still
error code 3?
Yes
Solved
No
No
No
Yes
Production date of the fridge?
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 4: DC heater is off when it should be on
Check if all the connections are
OK Restore the
connections
Change fuseCheck if the 20A fuse is OK
Check if the heater is using
current (+/-15 A large fridges
and +/-11 A small fridges)
Yes
Yes
Yes
Replace the
DC heater
No
No
No
No
No
No
No
!!! Note: put fridge off when
measuring the impedance off the
heater !!!
Check the resistance of the
heater, is this between min and
max?
Replace the
DC heater
Yes
Heater resistance:
Type MinΩMaxΩ
N3080 0.90 1.16
N3090 0.90 1.16
N3100 0.90 1.16
N3104 0.90 1.16
N3108 0.90 1.16
N3112 0.90 1.16
N3115 0.90 1.16
N3145 0.67 0.86
N3150 0.67 0.86
N3175 0.67 0.86
Production date of the fridge?
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 5: DC heater is ON when it should be
OFF.
Put the refrigerator off an on
(reset)
Is error code 5 gone?
No
Error solved
Yes
Production date of the fridge?
No
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 6: DC high voltage is out of range (lower
than 10 V or higher than 15 V)
Input high current voltage
supplied at the fridge is stable
between 10 V and 15V DC input issue non fridge related
If RV is equipped with a solar
panel, disconnect it. Is code 6
gone?
Issue with the solar panel
regulator or solar panel.
No
Yes
Yes
!!! If DC mode has been selected
manually, the refrigerator is not
switching automatically to
another source of energy when
the engine is off !!!
No
Production date of the fridge?
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 7: No “engine run” signal is present and
control is in Manual DC mode.
Input D+ voltage supplied at the
fridge is stable between 10 V and
15 V
D+ input issue
non fridge
related
No
!!! To know if D+ polarity is
good, select manually DC mode
and engine off. If no error code
occurs, that means that the D+
input is reversed. Ensure power
supply is capable to supply
correct amperage !!!
Yes
Production date of the fridge?
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 8: AC heater current is measured to be
75% below nominal current.
Input AC voltage is between 190
VAC and 260 VAC
AC input issue
non fridge
related
No
Yes
!!!Note: put fridge off when
measuring resistance off the heater!!!
Change fuse
Check if the heater is using
current (+/-1 A Large fridges +/-
0.7 A Small fridges)
Yes Replace the
AC heater
No
No
No
No
No
No
Check the resistance of the
heater, is this between min and
max?
Replace the
AC heater
Yes
Yes
Production date of the fridge?
Heater resistance:
Type MinΩMaxΩ
N3080 302 389
N3090 302 389
N3100 302 389
N3104 302 389
N3108 302 389
N3112 302 389
N3115 302 389
N3145 210 270
N3150 210 270
N3175 210 270
Troubleshooting
N3000 -series
Check if the fuse is OK
Before 3-3-2014 = 4A
Serial number < E062R1000006
After 3-3-2014 = 2A
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 9: AC heater is ON when it should be OFF
Put the refrigerator off an on
(reset)
Is error code 9 gone? Error solved
Yes
No
Production date of the fridge?
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 10: AC mains supply is out of range
Input AC voltage supplied at
the fridge is between 190 VAC
and 260 VAC?
AC input issue non fridge related
No Production
date of the
fridge?
Troubleshooting
N3000 -series
Production date of the fridge?
Before 08-02-2016
Serial number < E039T…..
After 08-02-2016
Serial number > E039T…..
Input AC voltage supplied at the
fridge is between 200 VAC and
260 VAC?
No
Yes
Replace power board assembly
(691101)
AC input
issue non
fridge related
Yes
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 11: No energy source is available and
control is in AUTO mode
Select all the sources manually
and check if an error code
occurs.
See the description of the error
codes
Yes
No
!!! Make sure that an energy
source is available!!!
Production date of the fridge?
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 12: Display board and power board lose
communication with each other.
Input DC low current voltage at
the fridge is between 10 V and
15 V
DC input issue
non fridge
related
Disconnect 12V and wait 5 min
(resettable fuse can cool down)
Connect 12 V, still error code
12?
Restore
connections
Solved, does
error occurs
again?
Are the connectors on the
display board and power board
OK?
Measure on the communication
connector on the power board
(connector with 4 wires)
between white (+) and green(-)
on DC. Is there +/-5V?
No
Yes
Yes
Yes
No
No
No
Yes
Yes
Fix pins if
possible
Check if the pins in the wiring
loom plug are present and not
bent or loose
No
Yes
Yes
No
Troubleshooting
N3000 -series

Error code 12: Display board and power board lose
communication with each other.
Yes
Measure on the display board
between white and green. Is
there +/-5V?
No
Measure on the display board
between the yellow (+)and
green(-) wire on AC. Is there a
pulse that is going on and off
between 0.5 and 0.7 VAC?
Replace cable
between
power-and
display board
Yes
Contact
Thetford
Yes
No
Production date of the fridge?
Yes
No
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Error code 13: Thermistor fails; control
automatically switches to Backup Operation System
Check if thermistor is present Install
thermistor
Check if the thermistor is
plugged in correctly into the
connector
Connect
correctly
Plug in
correctly
Fix pins if
possible
Check if the wiring loom is
connected to the power board
correctly
Check if the pins in the wiring
loom plug are present and not
bent or loose
Measure continuity of cable
No
Yes
Yes
Yes
Yes
No
No
No
Replace cable
No
Yes
Production date of the fridge?
Troubleshooting
N3000 -series
Replace thermistor
Error code 13 dissolved?
No Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Inadequate performance on 12 VDC source and no
error code.
Check if the input at the DC HC
poles of the power board is
>12V when the 12V heater is
enabled
DC HC input
issue
Check if the input at the heater
connection to the power board
is > 12V
Yes
Yes
!!! Do the testing of the fridges
on the manual mode of this
source !!!
Check if the thermistor is
properly fitted on the 5th fin from
the right inside the cooling
cabinet.
Install
thermistor on
the right
place.
No
Yes
No
Production date of the fridge?
Replace DC
heater
No
Check if the DC heater is properly
installed.
Contact Thetford
Yes
Yes
Install the DC
heater
properly
No
No
Check if the heater is using
current (+/-15 A large fridges and
+/-11 A small fridges)
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Yes
No
Yes
No
Production date of the fridge?
Replace AC
heater
No
Check if the AC heater is properly
installed.
Contact Thetford
Yes Install the AC
heater
properly
No
Inadequate performance on 230 V source and no
error code.
!!! Do the testing of the fridges
on the manual mode of this
source !!!
Check if the input between the
(L) and the (N) at the power
board is over the 220V when
heater is enabled.
AC input issue
Check if the input at the heater
connection to the power board
is > 220V
Check if the heater impedance is
correct in Ohm (see table code 8)
Yes
Check if the thermistor is
properly fitted on the 5th fin from
the right inside the cooling
cabinet.
Install
thermistor on
the right
place.
No
Yes
Troubleshooting
N3000 -series
Before 22-6-2015?
Serial number < E173S…. Use for LED:LED KIT:SR 691138
Use for LCD:LCD KIT:SR 691139
After 22-6-2015?
Serial number >/= E173S….. Replace power board assembly (691101)

Inadequate performance on gas source and no
error code.
Injector of the burner is clean.
Flame is dense and blue. Gas
pressure is between 30 and
35mb
Clean the
burner or
replace the
burner in case
of bad
combustion.
And check
pressure.
Check if the thermistor is
properly fitted on the 5th fin from
the right inside the cooling
cabinet.
Install a flame
diffuser.
Check if the flame diffuser is in
the pipe.
No
Yes
No
Check if the burner is aligned
properly in front of the pipe.
Contact Thetford
Yes
Yes
!!! Do the testing of the fridges
on the manual mode of this
source !!!
Install
thermistor on
the right
place.
Align burner
No
No
Yes
Troubleshooting
N3000 -series