Overheating
â–¶ How to fix
Erase the fault code and test run the auxiliary heater. If the fault code recurs, renew the control unit.
What you'll see
No driver-visible symptom recorded.
System reaction
The auxiliary heater is locked.
Diagnostic depth
Detection
Auxiliary heater fails to start.
Possible cause
Too many occurances of overheating, or overheating at flame monitor.