Fault code Cause
# 160
Undervoltage < 10.2 V
# 161
Overvoltage > 16.4 V
# 162
Open window above cowl (window switch)
# 164
No 230 V operating voltage
230 V fuse defective
Overheating protection has been triggered
# 170
Risk of low voltage < 11.5 V
# 255
Heater has no 12 V power supply
No connection between heater and control panel
If these measures do not remedy the fault or if fault codes are displayed that you cannot find in the troubleshoot-
ing guide, contact Truma Service.
Troubleshooting guide (air conditioning system)
Fault code Cause
# 1
Failure (short circuit or broken cable), room temperature
sensor
# 2
Ice sensor (inside) triggered
# 4
Ice sensor (outside) triggered
# 8
IR receiver unplugged or cable broken
# 17
Voltage drop at 230 V
If these measures do not remedy the fault or if fault codes are displayed that you cannot find in the troubleshoot-
ing guide, contact Truma Service.
power supply
Remedy
Check battery voltage, charge if necessary.
Short-term immediate measure. Switch off major consumers or start up
the vehicle engine until the heater starts to operate (approx. 4 minutes)
Battery capacity inadequate, if necessary exchange old battery
Check battery voltage / voltage sources such as the charger
Close windows
Restore 230 V operating voltage
Replace 230 V fuse (see Combi operating instructions)
Reset overheating protection (see Combi operating instructions)
Use the electrical power from the battery sparingly, e.g. restrict
lighting
Charge battery
Ensure that the 12V power supply is available
Make connection between heater and control panel
Remedy
Contact Truma Service
Inspect the filter and replace it if necessary
Keep the air inlets / outlets on the roof free of obstructions such as
leaves
Check the connection of the IR receiver
Check 230 V
power supply
43