95
# 402 Warm air temperature exceeded:
Not all warm air ducts are connected Check whether the 4 warm air ducts are
connected
Warm air outlets blocked Check the individual outlet openings
Circulated air intake blocked Remove the circulated air intake blockage
# 407 No 230 V operating voltage Restore 230 V operating voltage
230 V fuse defective Replace 230 V fuse (see Combi operating
instructions)
# 408 No gas supply in Mix mode Check gas supply. See fault # 507
(electronic heating continues in Mix mode)
# 412 Open window above cowl (window switch) Close windows
# 419 Overheating protection has been triggered Reset overheating protection (see Combi
operating instructions)
(gas heating continues in Mix mode)
# 507 Gas cylinder empty Replacing a gas cylinder
# 516 Gas cylinder or quick-acting valve in the gas
supply line closed
Check gas supply and open valves
# 517 Gas pressure regulation system iced up Use regulator heater (EisEx)
Butane content in the gas cylinder too high Use propane. Butane is unsuitable for heating,
particularly at temperatures lower than 10 °C.
Combustion air infeed or exhaust outlet is
sealed
Inspect openings for obstructions (slush, ice,
leaves, etc.) and remove any obstructions
Gas pressure regulation system faulty Inspect / replace gas pressure regulation
system
# 607 Max. number of fault resets reached Wait 15 minutes and reset fault
# 621 Room temperature sensor or cable faulty 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
# 624 FrostControl heating element has a short circuit Disconnect heating element plug from
electronic control unit. Replace heating element
If these measures do not remedy the fault or if fault codes are displayed that
you cannot find in the troubleshooting guide, contact Truma Service.
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