Overheat sensor
â–¶ How to fix
Check that the pipes for auxiliary heater air supply and air venting are not blocked.Check the fuel supply.Check the overheating sensor.Instructions for the checking procedures are found in the work description in Multi under 18-90 "H13, ATA Auxiliary heater - Air".
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The overheat sensor has detected a temperature above 120°C for ATA 1, and above 150°C for ATA 2.
Possible cause
Blocked air supply to the auxiliary heater, cold air.Blocked air vent from the auxiliary heater, heated air. Fault in the fuel supply. Fault in overheat sensor.