Webasto Thermo 90, Workshop Manual

Page: 17 / 53

3 Functional Description Thermo 90
304
3.6.3 Diagnosis after Switch-off upon Failure
(Thermo 90 S)
When equipped with a standard timer an error will cause
an output to the timer display:
F 01 No start (after 2 start attempts)
F 02 Flame-out during operation (repeated > 5)
F 03 Voltage too low or too high
F 04 Premature flame detection
F 05 Flame sensor open or short circuit
F 06 Temperature sensor open or short circuit
F 07 Dosing pump open or short circuit
F 08 Fan motor open or short circuit or wrong speed
of fan motor
F 09 Glow plug open or short circuit
F 10 Overheating
F 11 Circulation pump open or short circuit
When operated with switch the type of error lock-out
condition is indicated by an operation indicator light flash
code while the heater is in run-down.
After five short signals the following long flash pulses are
counted:
1x No start (after 2 start attempts)
2x Flame-out during operation (repeated > 5)
3x Voltage too low or too high
4x Premature flame detection
5x Flame sensor open or short circuit
6x Temperature sensor open or short circuit
7x Dosing pump open or short circuit
8x Fan motor open or short circuit or wrong speed of
fan motor
9x Glow plug open or short circuit
10x Overheating
11x Circulation pump open or short circuit