Faulty Heater Control switch/switches

Just out of the blue the climate control, heater fan control and max button have stopped working. I have checked the fuses and all appears to be OK. Haven't as yet taken the switches off to check but was wondering if anyone has any ideas what could be wrong?
 
Haven't had a flat battery recently, or disconnected it?

Might have gone into transport mode if the above has happened.
 
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