I have a worcester 280 the CH works fine but when i turn on the DHW the boiler runs for a minute or so then cuts out (the pressure rises & i lose some water from the PRV) then starts up again, the pump is new any ideas could it be the flow switch?
It does sound like your boiler has a blockage in either primary circuits or more commonly in the calorifier/plate heat exchanger.Not beyond a DIY but not the easiest old combi to work on.
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