Combustion air fan
â–¶ How to fix
Check the combustion air fan. Measurement points 1 and 4 in the connector to the auxiliary heater control unit. Approximately 1 Ohm. Check the combustion air fan sensors. Check internal connectors in the auxiliary heater.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The combustion air fan does not move.
Possible cause
Short circuit or interruption in the circuit for the combustion air fan.