Webasto Cooling Fan Control or Sensor Fault

Webasto charger’s internal fan (if equipped) runs loudly or continuously, even at low load or when idle.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Stuck temperature sensor reading high, Dust-clogged fan causing reduced airflow, Failing fan bearings, Firmware misreading temperature

Safety first: Fan service requires opening the unit; isolate power first.

Check ambient temperature: Ensure the charger is not installed in a very hot or enclosed space causing genuine high temperatures.
Listen for grinding: A grinding or rattling noise indicates worn fan bearings and need for replacement.
Service cleaning: A technician can open the unit, clean dust from the fan and vents, and test the temperature sensor.
Replace components: Replace the fan or temperature sensor if they are not operating within specification.

Medium 3/5

Webasto Internal Cooling Fan / Temperature Sensor

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