Air Top Evo 3900 / Air Top Evo 5500
Fault lock-out
91
15
Fault lock-out
The control unit has identified errors on individual heater components and
faults during the operation.
The heater is shut down (fault lock-out) if:
– No or incorrect start
– Temperature sensor defective
– Overheating sensor interrupt or short circuit
– Overheating sensor installed incorrectly
– Glow plug interrupt or short circuit
– Fan motor overload or blocked
or short circuit or interrupt
– Error in the metering pump or overheating guard circuit (start phase on-
ly)
– Undervoltage < 10.5 or overvoltage > 16 V, longer than 20 seconds (for
12 V heater)
– Undervoltage < 20.5 or overvoltage > 31 V, longer than 20 seconds (for
24 V heater)
– Control unit defective
– Overheating
The fuel supply is stopped if the heater overheats.
The heater continues to run in the same way as if it is switched off manu-
ally.
After it stops the control unit will be set to fault lock-out.
The overheating is indicated by the indicator flashing 10 times.
Rectify the cause of the fault.
To reset the fault switch the heater on and off briefly (at least 2 seconds).
If serious faults like overheating or failure to start occur frequently, then the
heater will be locked permanently (F12). It can be returned to operation by
disconnecting the supply voltage with the heater switched on (e.g. remove
fuse and install again).
Repairs must only be carried out by specialist personnel trained by Webas-
to.
Installation_Instructions_Air_Top_Evo_3900_5500_de_en_nl.book Page 91 Wednesday, November 3, 2010 11:58 AM
