CEM-5F39

Condition
If the flame goes out unexpectedly during operation, this will be interpreted by the control unit as a fault and diagnostic trouble code CEM-5F39 will be set.

Condition
None.

Possible source
- No fuel feed.
- Contact resistance in control unit connector.
- Open circuit in signal wire.
- Signal wire short-circuited to voltage supply.
- Flame indicator covered with soot.
- Defective flame indicator.
- Open circuit in ground wire.

Condition
- Poor interior heating.