Mennekes Cooling Control / Temperature Sensor Drift

Charger’s internal fan runs continuously even when no vehicle is connected.

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

Faulty temperature sensor reading high, Stuck fan control transistor, Firmware bug keeping fan on, High ambient temperature near limit

Safety first: De-energize before internal checks.

Check ambient conditions: Measure room temperature; if near the upper limit of the charger’s rating, improve ventilation.
Inspect temperature sensor: Ensure the sensor is properly attached to the heat sink or power module and wiring is intact.
Replace sensor or fan control: If sensor readings are incorrect, replace the sensor. If the fan is powered even with normal sensor readings, the fan control circuit on the PCB may be faulty and require board replacement.

Medium 3/5

Temperature Sensor / Main Control PCB (Fan Driver)

Check Price on Amazon

We may earn a commission from links on this page.