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The control unit continuously monitors the heater operation. The control unit
identifies errors on individual heater components and faults during operation.
Should the control unit experience component errors and operational fault
s, the
heater may be shut down.
Causes:
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
– Ceramic glow pin interrupt or short circuit
– Fan motor overload or blocked or short circuit or interrupt
– Error in the fuel metering pump or circuit
– Under voltage or over voltage for longer than 20 seconds.
– Control unit defective
– Overheating
Effects:
The fuel supply is stopped if the heater overheats.
The heater continues to run in the same way as if it is switched off manually.
After the heater stops the control unit may set in fault lock-out mode.
Heater Lock out Reset Procedure:
1. Using switch or standard timer control, turn heater on
2. Remove the main power connection to heater from battery or pull fuse for a
minimum of 20 seconds.
3. Using switch or standard timer control, turn the heater off.
4. Reinstall main heater power connection where previously disconnected.
Rectify the cause of the fault.
IMPORTANT: Heater fault codes can be read using PC Diagnostics, however,
the heater lockout reset must be manually performed using the procedure
stated above.
If you have any questions, contact our technical support team at (800)
860-7866 or via email at: info-us@webasto.com.
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