Truma heating problem

[DeliDave_]

Our fan on Truma heater would only run on full speed on our recent outing I am presuming that I need a new fan control switch ,are there any checks I need to do before I replace it.Van is an Indiana S6
Many thanks.

 

[Jaydug]

In my caravan parts box I have a brand new control switch . I bought it thinking mine was faulty but having changed it I realized it was OK. The fault was in the pcb which when changed got the fan working again.

 

[DeliDave_]

Thanks for that,Ill take it apart and see if theres any obvious clues.