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Can anyone help with this mystery ive asked many paople and nobody upon nobody knows what it is. boiler works fine for c/h Hot water the pin does not come out far enough to hit the microswitch whuch makes the boiler fire doen all the usuals diaphragm ok in pump proving switch auto...

Can anybody answer this. called in at a job tio change broken 3 port valve. changed over 3 port valve wires were terrible and all over the place so decided to tidy up a bit all was going well till realised that there was no hw off wire from the programmer theres a ch on wire and hw on...