34020-01385 · 00 · 07/2022
25
EN
Troubleshooting guide
Truma CP plus
13 Troubleshooting guide
If these measures do not remedy the malfunction or if fault codes are displayed that you cannot find in the
troubleshooting guide, contact Truma Service.
13.1 Heater Combi / Combi E (H)
Fault
code
Cause
Remedy
W 17 H
Warning Water overheat condition (woc)
Switch heater off and allow it to cool�
Fill the water container with water
W 18 H
Warning Air overheat condition
Not all warm air ducts are connected
Make sure that all warm air ducts are connected to the heater
Warm air outlets blocked
Check whether the warm air ducts are damaged or kinked
Circulated air intake blocked
Remove the blockage in the circulated air intake and ensure that the
installation space is sufficiently ventilated
W 24 H
Imminent low voltage /
battery voltage too low < 10�4 V
Check the function with the motor running, check the power supply
unit or other batteries� Charge battery and check contacts, replace
old battery
E 29 H
Power consumption of the FrostControl heating element
too high
Replace FrostControl heating element
W 42 H
Window switch detects open window
Close window above cowl
E 43 H
12 V power supply faulty (overvoltage)
Check the 12 V power supply at the appliance input under load; to
test, disconnect the power supply unit and the solar system from the
on-board power supply
W 45 H
230 V power supply faulty
Check the 230 V power supply at the appliance input
Have an expert check the 230 V fuse and replace it if necessary
Reset the 230 V overheating protection (see Combi operating
instructions)
E 111 H
Fault in the electronics
Check the 12 V power supply at the appliance input under load; to
test, disconnect the power supply unit and the solar system from the
on-board power supply
