34020-01385 · 00 · 07/2022
29EN
Troubleshooting guideTruma CP plus
Fault
code
Cause Remedy
E 162 H Window above cowl open (window switch) Close window above cowl
W 163 H One of the temperature switches has opened Allow the heater to cool� If this occurs frequently, contact
Truma Service
W 164 H 230 V power supply faulty
•
Check the 230 V power supply at the appliance input
•
Reset the 230 V overheating protection (see operating instructions)
•
Have an expert check the 230 V T10AH fuse and have it replaced
if necessary / Before opening the connection cover, completely
disconnect the appliance from the power supply / Replace the con-
nection cover before restarting the appliance
W 170 H Imminent low voltage < 11�5 V
•
Ensure 12 V power supply under load at appliance input / check for
AC voltage components (disconnect power supply unit and solar
system from on-board power supply)
•
Charge battery and check contacts, replace old battery
•
Short-term immediate action, switch off high-consumption ap-
pliances or start up vehicle engine until the heater starts running
(approx� 4 minutes)
W 255 H
•
No connection between heater and control panel
•
Heater has no 12 V power supply
•
Control panel cable faulty
•
Ensure 12 V power supply under load at appliance input / check for
AC voltage components (disconnect power supply unit and solar
system from on-board power supply)
•
Check the control panel cable and make sure there is connection
between the heater and the control panel
•
Have an expert check the device fuse and have it replaced if neces-
sary / Before opening the connection cover, completely disconnect
the device from the power supply / Replace the connection cover
before restarting the device
W 301 H,
W 417 H,
E 540 H
12 V power supply faulty (overvoltage) Ensure 12 V power supply under load at appliance input / check for
AC voltage components (disconnect power supply unit and solar sys-
tem from on-board power supply)
W 302 H,
W 418 H,
E 541 H
12 V power supply faulty (low voltage)
•
Ensure 12 V power supply under load at appliance input / check for
AC voltage components (disconnect power supply unit and solar
system from on-board power supply)
•
Charge battery and check contacts, replace old battery
•
Check function with motor running, check power supply unit or
other batteries
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