Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Removal of Front Case
Remove the 4 retaining screws, 2 at the top and 2 at the bottom.
The front panel pulls off forwards.
Remove the two screws from the bottom rear of the PCB box to lower it and unclip the cover to expose the PCB.
The Summer/Winter Switch has two position, Winter position (IN) and Summer Position (OUT)
Note:
Care this appliance may have sharp edges!