For some reason every now and then the heater controls just wont work, they are totally dead, the heaters wont switch on and the neither of the Recirc or Aircon lights illuminate, after the car is switched off and back on a couple of times it springs back into life and works fine until one day it decides to not play ball again.. Once its going it never turns off when the car is running so I assume its not a loose connection, is there any kind of override switch on the system or something that may be disabling the heater?

Thanks for any info!

Cheers.