Fault Switch-Off - Webasto Air Top 2000 STC Installation Instructions Manual

Fault switch-off

15 Fault switch-off
The control unit identifies faults in individual heater components and mal-
functions during operation.
The heater shuts down (fault lock-out) when:
– No or faulty start
– Temperature sensor defective
– Overheating sensor interrupted or short-circuited
– Overheating sensor installed incorrectly
– Glow plug interrupted or short-circuited
– Fan motor overload or blocked or short-circuited or interrupted
– Fault in fuel pump electrical circuit or in overheating protection (only
during start phase)
– Undervoltage <10.5 V or overvoltage >16 V, longer than 20 s
(12V heater)
– Undervoltage <20.5 V or overvoltage >31 V, longer than 20 s
(24V heater)
– Control unit defective
– Overheating
– Flame monitor defective (petrol heater)
The fuel supply shuts down in the event of overheating.
The heater continues to run (afterrunning period) as when switched off
manually.
The control unit is in fault lock-out at the end of the afterrunning period.
Overheating is indicated by the operating indicator flashing 10 times.
74
Rectify fault.
Briefly switch the heater on and off (at least 2 seconds) to reset fault lock-
out.
The heater will be locked (F 12) if serious malfunctions such as overheating
or failure to start occur frequently and can be restarted by disconnecting the
power supply with the heater switched on (e.g. by removing and
reinserting fuse).
Air Top 2000 STC