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Chaps, To let you all know I changed the PCB and the boiler fired up first time. It was easy but I took a few pictures to ensure all the wires were correct. The PCB (900847 ~ 2 fuse type; 105111) was ordered on Sunday night from www.keeptheheaton.com and it arrived on Tuesday afternoon...

My boiler wont ignite. It has been an intermittant fault of the fan "hunting". Sometimes the boiler sits in this loop but sometimes she blasts up. I have stripped and cleaned the boiler parts (not desturbing the gas parts). I have checked the air pipes both positive and negitive and...