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sorry - should have said 'electronic circuit diagram'.

Since the microswitch is switching properly during the short on/off cycling I now realise the fault is probably with the PCB electronics as was first suggested. Can someone help me find a schematic diagram of the PCB? I have an electronic knowledge and would like to have a go at repairing the fault.

Thanks for all replys. I'd like to investigate the air valve. I see that there are two air pipes attached to, it Red & Clear. What is the simplest way to check its operation - can I suck or blow on the inlets? I measured the voltages on the microswitch contacts and they appear to be change...

Potterton Profile 60e, fanned, balanced flue boiler PROBLEM - Boiler starts with fan for about 2 seconds then stops then fan starts again then stops. This cycle repeats perhaps four or five times; eventually fan remains on and ignition sequence starts - all is then well until the next time...