Troubleshooting Guide (Combi Gas Heater) From Year Of Construction 04/2018 - Truma CP plus Mode D'emploi

Troubleshooting guide (Combi Gas heater) from year of construction 04/2018

Fault code Cause
# 255 Heater has no 12 V power supply
No connection between heater and control panel
# 301 Overvoltage > 16.4 V
# 417
# 302 Low voltage. Battery voltage is too low < 10.0 V
# 418
# 303 Risk of low voltage. Battery voltage is too low < 10.4 V
# 411
# 401 Summer mode with empty water container
# 402 Warm air temperature exceeded:
Not all warm air ducts are connected
Warm air outlets blocked
Circulated air intake blocked
# 407 No 230 V operating voltage
230 V fuse defective
# 408 No gas supply in Mix mode
# 412 Open window above cowl (window switch)
# 419 Overheating protection has been triggered
# 507 Gas cylinder empty
# 516
Gas cylinder or quick-acting valve in the gas supply line
# 517
closed
Gas pressure regulation system iced up
Butane content in the gas cylinder too high
Combustion air infeed or exhaust outlet is sealed
Gas pressure regulation system faulty
# 607 Max. number of fault resets reached
Remedy
Ensure 12 V power supply
Make connection between heater and control panel
Check battery voltage / voltage sources such as the charger
Charge battery. If necessary replace old battery
Charge battery
Switch heater off and allow 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
Restore 230 V operating voltage
Replace 230 V fuse (see Combi operating instructions)
Check gas supply. See fault # 507
(electronic heating continues in Mix mode)
Close windows
Reset overheating protection (see Combi operating instructions)
(gas heating continues in Mix mode)
Replacing a gas cylinder
Check gas supply and open valves
Use regulator heater (EisEx)
Use propane. Butane is unsuitable for heating, particularly at tem-
peratures lower than 10 °C.
Inspect openings for obstructions (slush, ice, leaves, etc.) and
remove any obstructions
Inspect / replace gas pressure regulation system
Wait 15 minutes and reset fault
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