Hi Fran213
I also have a 1993 Hymer c class I have had a look at mine and it seems for a start that you have to remove the 2 screws at the bottom of the heater facia and prise the knobs off heater control levers this should allow you to pull the facia forward and gain access to the back of the switch.
I have not had to replace mine but this is how I would approach it
Hope this helps
Good luck
Richard
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