14 | Basic Troubleshooting
14.4
Diagnostic Fault Codes
Diagnostic fault codes can be communicated to the end-user without the use of the Webasto PC Diagnostic
kit and software.
If the system is operated with a switch, the fault is indicated by a flashing code on an indicator light (rocker
switch) during heater operation. There will be a series of rapid flashes, followed by 1 or more slow flashes.
The rapid flashes are an alert indicator, the slow flashes should be counted as that is the fault code. If the
system is equipped with a digital timer, a fault message appears on the display of the timer after a fault oc-
curs:
F00 (Continuous flashing) – Heater interlock (lock-out)
After five short signals, count the long flashes:
F01 (1 flash) - No start (after 2 attempts to start)
F02 (2 flashes) - Flame failure
F03 (3 flashes) - Under-voltage or over-voltage
F04 (4 flashes) - Premature flame recognition
F05 (5 flashes) – Not used
F06 (6 flashes) – Coolant temperature sensor interrupt or temperature sensor short-circuit
F07 (7 flashes) - Metering pump interrupt or metering pump short-circuit
F08 (8 flashes) – Combustion air fan motor interrupt or blower motor short-circuit or incorrect speed
F09 (9 flashes) - Glow plug interrupt or glow plug short-circuit
F10 (10 flashes) - Overheating
F11 (11 flashes) - Circulating pump interrupt or circulating pump short-circuit
F12 (12 flashes) – Battery main switch short-circuit
F13 (13 flashes) – Output vehicle fan short circuit
F14 (14 flashes) – Overheating sensor defective
F15 (15 flashes) – Pre-heating/ignition circuit defective
F16 (16 flashes) – Exhaust gas temperature too high
F17 (17 flashes) – Exhaust gas temperature sensor defective
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