Just repaired mine with the same fault. Had to fit a new Diamond H Controls -Energy Regulator which is situated behind the Grill Control Knob. Cost was around £14 with P & P & VAT from Partmaster.co.uk. Their Product code was HPT6204034 and the Number on the label on the defective Part was 40ER101C1.
Turn off the power and pull the Oven half out of its Kitchen Housing and remove the metal top to the case. Controller is inside the front and just clipped into position. Pull the knob off. Pull off the wire connectors one by one and push them on the new controller to the same connectors. Re-fit is the reverse.
Stuart
January 2009
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