Faults; Fault Lock-Out Due To Faults In The Heater; Fault Lock-Out In Case Of Undervoltage Or Overvoltage - Webasto Thermo 50 Einbauanweisungen

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Thermo50_02_gb_g.fm Seite 54 Dienstag, 27. Mai 2003 12:08 12

Faults

13 Faults

13.1. Fault lock-out due to faults in the heater

Fuel is supplied for max. 180 seconds if the flame does not start to burn.
The fuel supply is shut off immediately if the system overheats
(temperature limiter is tripped).
In all cases (except a fault in the combustion air fan), the fan is
interrupted for 5 seconds and the heater continues to run for
120 seconds after a fault lock-out. The run-on times may vary,
depending on the software version in the control unit.
IMPORTANT:
If the system is equipped with a standard clock, a fault message appears
on the display of the timer after a fault occurs.
If the system is operated with a switch, the nature of the fault is indicated
by a flashing code on an indicator light during the run-on time of the
heater.
See the fault code output in the operating and maintenance instructions
for more information.

13.2. Fault lock-out in case of undervoltage or overvoltage

A fault lock-out with a regular switch-off procedure takes place if there is
an undervoltage of < 21 volts (measured at the wiring harness input) for
20 ± 1 seconds.
A fault lock-out with a regular switch-off procedure also takes
place if there is an overvoltage of > 32 volts (measured at the
heater) for longer than 6 ± 0.5 seconds.
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13.3. Cancelling the fault lock-out
Once the cause of the fault has been eliminated, the fault lock-out is
cancelled by switching the heater off and on again.
After overheating, the fault lock-out is cancelled by removing fuse F1,
15 A for at least 10 seconds.
The fuse is not blown after overheating.
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