Technical data

Air Top 2000 ST Fault lock-out
71
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 only)
– 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
– Flame monitor defective (petrol heater)
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 malfunctions such as overheating or failure to start reoccur, the
heater is locked (F 12) and can be put back into service by disconnecting
the power supply with the heater switched on (e.g. by removing and re-
inserting fuse).
AT2000ST_Installation_Instructions.book Page 71 Wednesday, May 29, 2013 12:54 PM