i have a thorn olympic boiler and the main fuse keeps triping. also when you switch the fuse back on the timer buzzes and ocasionally sparks even though the electricity switch is off. boiler fine just the timer.
Could be lucky and it might just be a loose wire in your 'timer box'. You have a direct short in any case. If it is a faulty timer its best to replace it with a seperate one as the built in ones cost arms and legs.
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