Service manual

Webasto Diesel Cooker X 100 4 Failure detection
403
4.2 General failures
Cooker does not respond at all.
Check the main cable connections
and the main switch.
Check fuses on main cable and on
control unit.
Cooker does not start.
Note: After two failed start attempt
the cooker is in lock-up state !
Check the battery voltage.
Battery voltage must be over 10,7 VDC.
Pump
Operating voltage is under 10.7 VDC ?
(Measure the voltage from control unit’s
voltage connector).
How to repairFailure symptom Possible reason
Pump does not get get pulses.
Red LED does not blink on control board.
Check the control unit.
Pump get’s the puls, but pump piston does
not move.
(A small ticking sound can be heard when
the piston moves)
Check the pump.
(Sometimes a small tapp on pump’s side
help’s to relase the piston, if necessary
change the pump).
Check the pump wires / wiring and over
heat protector’s condition.
A) Yes.
Check the control unit, control
panel and control panel cable.
B) No. See how to repair.
Glow plug
Glow plug is faulty.
(fault blinking).
Visual check, (often the plug changes
form when faulty).
Glow plug does not get sufficient voltage.
(Glow plug is not hot enough).
Check that the main cable cross area
(mm²) is large enough. Check also all
connections.
Pump get pulses and piston moves, but
fuel does not move inside the fuel line.
Check if the fuel needle or fuel filter is
blocked.
Removing Lock-Up:
1. Turn the cooker ON (lock-up LED
is blinking).
2. Unplug the main cable (blinking
goes OFF).
3. Plug in the main cable (yellow LED
blinks couple of times).
4. When yellow LED goes OFF, turn
cooker OFF.
IFuel line joint to the pump is loose and
pump get’s air.
Check and tighten joint.
Pump is worn or dirty and can not pump
fuel.
Replace the pump.