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Agreed. I've PM'd you to ask whether you'd like to take a look.

Yes thanks. I'd already replaced the diaphragm, and cleaned an lubricated the pin. Pin was initially stuck in, giving the pilot light failure you mention. With hindsight, had to be stuck pin, not diaphragm, as the differential pressure on the diaphragm pulls the pin in. Also, could have...

I'm puzzled about the correct operation of this flow switch (the one which controls the fan, mounted on the heating manifold). With everything off, the plunger is out [Seems correct] In CH mode, the plunger retracts when the pump is running, which I think is correct. [The CH seems to...