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Hi This definitely sounds like a problem with the plate heat exchanger.When you open a tap or taps does the boiler fire up then after a little while shut down then repeat the sequence?If yes you have either a scaled or dirty plate heat exchanger. this will need either descaling and cleaning , if its very bad then i would suggest a replacement.
Hi if its plate heat exchanger it doesnt matter what you do it all becomes apparent when they look inside unfortunately so im sorry but i cant suggest anyway of getting round it.