0x04F0E5, Combustion Air Fan Open Load
- replace combustion air fan/ECU - for further information see workshop manual - clear error memory
What you'll see
No driver-visible symptom recorded.
System reaction
- this DTC is stored in the error memory - heating operation is disabled - if failure occurs during heating operation, combustion will stop due to missing combustion air flow (see DTC 0x0EF0E7 - multiple flame interruption - failure afterrun is initiated Heater Actions: * This DTC is an error * Temporary Interlock is activated * counter "SZ / general error counter" is incremented
Diagnostic depth
Enable Condition: This error is monitored before combustion air fan is active. Mature Threshold: Open load in combustion air fan circuit detected. This DTC is reported by the heater core software. De-mature Criteria: Stable combustion reached after restart of heater: Heating request is switched off (HeaterModeRequest = DeactivateHeater) and on (HeaterModeRequest = NormalMode) and state HEATER RUNNING is reached
- failure in combustion air fan hardware - ECU hardware failure