Troubleshooting Guide (Combi Diesel Heating System) - Truma CP plus Mode D'emploi

Fault code Cause
# 621 Room temperature sensor or cable faulty
# 624 FrostControl heating element has a short circuit
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 (Combi Diesel heating system)

Fault code Cause
# 111 Room temperature sensor or cable faulty
# 122 Lack of fuel due to insufficient fuel tank filling, tank has
run empty and / or vehicle is on a slope
# 131 No connection between heater and control panel
# 132 FrostControl heating element has a short circuit
# 150 Warm air temperature exceeded:
Not all warm air ducts are connected
Warm air outlets blocked
Circulated air intake blocked
# 151 Water temperature exceeded in winter mode:
Water temperature sensor excessive temperature
Warm air outlets blocked
Circulated air intake blocked
# 152 Water temperature exceeded in summer mode:
Water temperature sensor excessive temperature
Warm air outlets blocked
Circulated air intake blocked
42
Remedy
Inspect the room temperature sensor cable, replace if faulty
Check the resistance of the room temperature sensor.
15 °C – 16.2 kOhm / 20 °C – 12.6 kOhm / 25 °C – 10.0 kOhm
Replace room temperature sensor if faulty
Disconnect heating element plug from electronic control unit. Re-
place heating element
Remedy
Inspect the room temperature sensor cable, replace if faulty
Check the resistance of the room temperature sensor.
15 °C – 16.2 kOhm / 20 °C – 12.6 kOhm / 25 °C – 10.0 kOhm
Replace room temperature sensor if faulty
Fill tank with fuel. Then fill the fuel line as described in "Initial start-
up" (see Combi Diesel operating instructions).
Make connection between heater and control panel
Disconnect heating element plug from electronic control unit.
Replace heating element
Check whether the 4 warm air ducts are connected
Check the individual outlet openings
Remove the circulated air intake blockage
Switch off appliance and allow it to cool down. Fill boiler with water
Check the individual outlet openings
Remove the circulated air intake blockage
Switch off appliance and allow it to cool down. Fill boiler with water
Check the individual outlet openings
Remove the circulated air intake blockage