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34020-01385 · 00 · 07/2022
EN
Troubleshooting guide
Truma CP plus
Fault
code
Cause
Remedy
W 303 H,
W 411 H
Risk of low voltage� Battery voltage too low < 10�8 V
•
Ensure 12 V power supply under load at appliance input / check for
AC voltage components (disconnect power supply unit and solar
system from on-board power supply)
•
Charge battery and check contacts, replace old battery
•
Check function with motor running, check power supply unit or
other batteries
W 423 H
Initial filling required (filling function at initial start-up)
Activate initial filling by setting a heating request with temperature
settings 30 °C
W 424 H
Initial filling active – after initial filling, the heater auto-
matically switches to normal operation with a tempera-
ture setting of 30 °C
Do not switch the heater off or interrupt the power supply during
initial filling
E 560 H
Maximum number of start attempts reached – operation
blocked
Contact Truma Service
E 561 H
Heater will not start�
Note: The device is locked after five unsuccessful start
attempts
Check the fuel supply at the appliance input
E 565 H
Heater will not start, flame repeatedly not detected� One
more repeat start for initial filling possible
Check the fuel supply at the appliance input
