If a fault occurs, check that the fuses and plug connections are in perfect condition and
secure.
When a fault occurs, the heater switches to the fault interlock; an error is not indicated on
the clock display.
Always try to cancel the fault interlock before calling a Webasto service centre.
The following faults can be remedied directly by the user:
Note:
The heater switches on again when the fuse is refitted.
Please contact a Webasto service centre if the fault cannot be remedied in this way.
Fault description Possible cause Remedy
Heater switches off
automatically (= fault lock-
out)
No combustion after
starting and restarting.
Flame goes out during
operation.
Switch off heater and switch
on again (not more than
twice).
Heater does not switch on. Heater is without electric
power.
Check power supply to heater
and ground connections.
Heater switches off during
operation (= fault lock-out).
Heater has overheated
due to lack of coolant.
Refill coolant as directed by
manufacturer.
Interrupt power
supply by removing
the 20 A fuse
(yellow) in the
heater cable
harness
Refit the fuse. Briefly press ON button
on transmitter on left or
press buttton on
timer
Interrupt power
supply by
removing the 20 A
fuse (yellow) in the
heater cable
harness
Refit the fuse.
The heater
switches on
again.
Action in the event of faults
To cancel the fault interlock
ON
ON
Wait
approx.
3 s
Wait
approx.
3s
Wait
approx.
3s
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