Truma heater

[Gina II]

Having problems with my truma heater, it heat ups lovely but the circulation fan is not working. I have bench tested the fan and it works. Any ideas would be grateful as we are touring in Germany and it's getting cooler.
Tia Dave

 

[GeoffnDee]

Could it be a faulty air temperature sensor (thermostat) , or its connection to the Truma Combi ?

 

[PDrill]

Disconnect the sensor and Truma should give max power no matter the temp adjustment.