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depending on its location, could it be air trapped in the pump (may be excasperated when hot). Have you tried bleeding the pump? If not, then agree - sounds like new pump

Thanks, I can see how that might help. I will give it a go (after I test the air pressure switch - just in case!!!!). Sadly even though I have the installation and servicing manuals for this boiler, they are pretty useless at the level of info they provide. But the jumpers might be marked on...

It does affect the central heating as well, but this is not so noticeable, or as much of an issue as the heating only switches in and out a couple of times during the evening on the room thermostat, and a one minute start up is not even noticed unless you happen to be stood by the boiler when...

Is the pump going to run just the en-suite shower or both showers/bath or all taps in the house? A friends ran two showers off one pump which worked fine except if two people had showers at the same time, the cold water tank ran dry in about 5 minutes. He had to upgrade his water tank to a...

I've read through a lot of problems with the 23 MFFI but not found any like mine yet and wondered if anyone had suffered the same or knew what the problem is Recently moved in and this 4year old combi was already there, and seemed to work fine, though noticed primary water pressure was near 0...