as I have the same boiler it could 1 of 2 things, firstly the overheat stat situated under the cover left of centre resting on a pipe with 2 wires coming from it, could be faulty or in the case of ours the circuit board is faulty, I know from experience that the board is an off the shelf item from spares outlets at £110.00
Will Stirling
October 2006
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