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Once clearway of plate heat exchanger, diverter and manifold on dhow side proved, the pump was the only thing left.

the diverted was overhauled with new diaphragms, I did not suspect the pump as the proving switch was operating fine in ch mode . Obviously the pump performance was not what it should have been

New pump head, all is good

I thought pump was ok due to the fact proving switch is fine in ch mode , if impeller was blocked proving switch would not make in ch mode ?

Thanks for reply, could it be dhw ht/ex as the pump proving switch is fine in ch mode

No hot water from taps when ch off, diverted overhauled and dhw operates fine when ch on but when heating off pump proving switch will not make , all diaphragms brand new pump proving switch ok when heating on, cheers in advance for any help

i have a baxi 80e combi boiler ,fitted about 18 months ago,my problem is on dhw side the burner ignites and the leds (water temp)go up as normal but then the burner cuts in and out giving me lukewarm water.Its as though the burner is tripping on high temp although the thermostat doesnt seem to...