Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to PCB (use Insulation Mat as required)

Observation:

Inspect connectors A10 and A11 on the PCB.
There should be a connector fitted with a wire link joining pins 2 and 4 on connector A10.
There should be a connector fitted with a wire link joining pins 1 and 2 on connector A11.
If this links are not present the preheat facility on the appliance will be disabled.
Are the links present?
Note:
There are two different versions of PCB for this appliance and the location of A10 and A11 is different, however the links are the same.