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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...