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GasBod
Tony, yeah u guessed it right, he's ex BG technical engineer
Gas112, he changed both top and front (larger) diaphragms including but and washer at front etc, cleaned & lubed up with silicone stuff but still, the top pin not hitting high enough to switch fan on with just DHW. The DHW does work upto 20 mins after switching CH off though.
He said he's been looking at manual and it could possibly be a water filter blocked? Is it the filter gauze in the flow regulator thing?
Sounds like divertor is partially seized,seen it a few times on these boilers.