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Just in case anyone is still wondering or might find it useful, I can tell you how it has ended. Eventually I tried bridging across the HW flow switch to see if that would get heat out to the rads which it did for me that completely ruled out diverter valve etc. I spent time trying to work out...

No there are definitely no dripping hot taps -- only three to check here. Even if there were, I would expect to get cold boiler to fire up once and then fail to get heat flowing out to the rads.

I had this happen with my boiler a couple of years ago. It took me some time to work out that it was the boiler tripping the rcd. It was the DHW switch. The gland for the shaft operating the microswitch had started to leak and since this was likely to happen it had been positioned directly...

I have a roughly eight year old Puma 80e. HW is working but CH is intermittant. When heating is turned on in the morning boiler just does not fire up even though it is completely cold. Sometimes after running HW the CH starts working normally (i.e. pump running and flame on and off with a...