Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Gain access to the display PCB
Note.
For access to the display PCB remove the 4 screws from the front facia then remove, be careful not to damage the pressure gauge capillary tube during the process

Observation:

Check for correct spindle alignment into the potentiometer
and that the spindle has not snapped.