Troubleshooting Guide For Combi Gas Heater (H) - Truma CP Plus Mode D'emploi

Troubleshooting guide for Combi gas heater (H)

Fault code Cause
W 17 H Summer mode with empty water container
W 18 H Warm air temperature exceeded:
Not all warm air ducts are connected
Warm air outlets blocked
Circulated air intake blocked
W 21 H Room temperature sensor or cable faulty
W 24 H Risk of low voltage. Battery voltage is too low < 10.4 V
W 29 H FrostControl heating element has a short circuit
W 42 H Window above cowl open (window switch)
W 43 H Overvoltage > 16.4 V
W 44 H Low voltage. Battery voltage is too low < 10.0 V
W 45 H No 230 V operating voltage
230 V fuse defective
Overheating protection has been triggered
E 112 H Gas cylinder empty
E 121 H
Gas cylinder or quick-acting valve in the gas supply line
E 122 H
closed
E 202 H
Gas pressure regulation system iced up
E 211 H
E 212 H
Butane content in the gas cylinder too high
Combustion air infeed or exhaust outlet is sealed
Gas pressure regulation system faulty
W 255 H Heater has no 12 V power supply
No connection between heater and control panel
36 EN
Remedy
Switch heater off and allow it to cool. Fill boiler with water
Check whether the 4 warm air ducts are connected
Check the individual outlet openings
Remove the circulated air intake blockage
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
Charge battery
Disconnect heating element plug from electronic control unit.
Replace heating element
Close window.
Check battery voltage / voltage sources such as the charger
Charge battery. If necessary replace old battery
Restore 230 V operating voltage
Replace 230 V fuse (see Combi operating instructions)
Reset overheating protection (see Combi operating instructions)
Replace the gas cylinder
Check gas supply and open valves
Use regulator heater (EisEx)
Use propane. Butane is unsuitable for heating, particularly at temper-
atures below 10 °C.
Inspect openings for obstructions (slush, ice, leaves, etc.) and
remove any obstructions
Inspect / replace gas pressure regulation system
Ensure that the 12 V power supply is available
Make connection between heater and control panel