Webasto Thermo 90 ST Operating Instructions Manual - Note
If the system is fitted with a standard timer, the fault is indicated on the timer's display after
an error has occurred.
NOTE
If the heater is activated by the switch, the types of malfunctions are indicated by
coded flashing signals via the operation indicator light during the run-on time of
the heater.
After five short signals, count the long flashes:
The coded flashing signals correspond to the numbers in the table below.
F 00/--
(only five short signals)
Heater lock-out or control unit defective,
Unlocking only possible by an authorised workshop
F 01
No start (after 2 starting attempts)
F 02
Flame failure
F 03
Undervoltage or overvoltage
F 04
Premature flame recognition
F 05
Flame monitor interruption or
flame monitor short circuit
F 06
Temperature sensor interruption or
temperature sensor short circuit
F 07
Metering pump interruption or
metering pump short circuit
F 08
Fan motor interruption or
fan motor short circuit
F 09
Glow plug interruption or
glow plug short circuit
F 10
Overheating
F 11
Circulation pump interruption or
circulation pump short circuit
Fan motor sluggish
Fault code output on the display of the standard timer
Fault codes
∞
9025292B_Operating_Instructions_Thermo_90_ST_WDT_en.fm Page 6 Monday, September 24, 2012 4:33 PM