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boiler keeps tripping with the hot water but heating ok ?

sime super 90 plus.what can a do to stop the boiler from constantly tripping.it seeems to be relataed to the hot water.
barry mckenzie, February 2011
might be domestic heat exchanger needs cleaning fully open a tap the burner should stay at maximum if it keeps modulating down the the above is the likely cause

brian, February 2011
link Click here to see other fixes for Sime.