34020-01385 · 00 · 07/2022
27EN
Troubleshooting guideTruma CP plus
Fault
code
Cause Remedy
W 408 H Gas supply interrupted in mixed mode Check that the gas supply has the correct operating pressure�
Start the heater in gas mode, acknowledge the fault and switch to
mixed mode
W 412 H Window switch detects open window Close window above cowl
E 507 H,
E 516 H,
E 517 H
Gas supply interrupted Check that the gas supply has the correct operating pressure
(see Fault catalogue, gas supply)
E 607 H Maximum number of fault resets reached / after more
than 4 resets within 15 minutes, the heater is blocked
Wait 15 minutes and reset fault
E 621 H Room temperature sensor or cable faulty Check the cable for the room temperature sensor and plug
connections
Replace the room temperature sensor
E 624 H FrostControl heating element has a short circuit Replace FrostControl heating element
E 632 H 230 V overheating protection has triggered Reset the 230 V overheating protection (see Combi operating
instructions)
13.2 Heater Combi D / Combi D E (H)
Fault
code
Cause Remedy
E 111 H Room temperature sensor or cable faulty Check the cable for the room temperature sensor and plug
connections
E 121 H Interruption in the metering pump – temperature switch
has triggered
•
Remove the blockage in the circulated air intake and ensure that
the installation space is sufficiently ventilated (see Combi operating
instructions)
•
Make sure that the altitude kit is used for heating mode at altitudes
above 4900ft / 1500m
•
Check cables, plugs and metering pump for interruptions
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