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Thanks all for replies, but have bitten the bullet and ordered a new pcb. Found one for £130 delivered which seemed the best price I could find on the net. Seems this is a known snag with the Microns, so here's hoping it fixes it. Cheers.[/b]

Hi all. Micron 60FF playing up. Boiler works fine but ignores the thermostats and runs almost continuously until radiators are red hot. Have to control heat by turning off mains to the programmer / timer. Thought it was the frost stat, but had that checked and replaced by an electrician, along...