Webasto Thermo 90 Operating Instructions - page 3
Fault Code Display
Fault Codes on the Display of the Combination or Standard Digital Timer
NOTE:
!
No start-up (after 2 start-up attempts)
Flame extinguished (at least > 5)
Undervoltage or overvoltage
Premature flame detection
Flame detector interruption or flame
detector short-circuit
Temperature sensor interruption or
temperature sensor short-circuit
Metering pump interruption or metering
pump short-circuit
Fan motor interruption or
fan motor short-circuit or
incorrect fan motor speed
Pencil-type glow plug interruption or
pencil-type glow plug short-circuit
Overheating
Circulating pump interruption or
circulation pump short circuit
F 01
F 02
F 03
F 04
F 05
F 06
F 07
F 08
F 09
F 10
F 11
After the occurrence of a malfunction, the fault is indicated on the display of the digital
timer if the heater is equipped with a standard digital timer.
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 after-run period of
the heater. The coded flashing signals correspond to the numbers in the table below
Heater turns itself off automatically (=fault lock-out)
Cause
Remedy
Troubleshooting
In the event of a malfunction, fuses and electrical connections should be checked for
proper condition and security.
If this action does not correct the defect, consult your authorized Webasto dealer.
After the heater has been shut down due to a fault lock-out, a coded flashing signal is
emitted through the operation indicator during the after-run cycle of the heater. These
coded flashing signals are designed to assist the authorized Webaste dealer in isolating
the fault.
Combustion was not established
during start-up and start-up repetition
Shutdown initiated by
temperature limiter (overheating)
Switch heater off and then on again.
If the heater fails to re-start consult your
authorized Webasto dealer
Heater overheats due to
lack/loss of coolant
Top up coolant in accordance with the
vehicle manufacturer's instructions
Voltage drop for more
than 20 seconds
Check fuses, electrical connections and
battery
Pushbutton of the temperature limiter must be
pushed in prior to restarting the heater.
Flame goes out during operation
Subject to change