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HALSTEAD ACE HE30?

WHEN TURNING ON HOT WATER, BOILER WILL OFTEN CUT OFF AFTER 30 SECONDS OR LESS AND THEN FIRE UP AGAIN AFTER 2 MINUTES OR MORE OF RUNNING WATER. WHICH IS IRRITATING AND A WASTE OF WATER. ANY SUGGESTIONS ?
ALVIN GREGORY, June 2008
its either a faulty dhw thermister (thinks the water is boiling)
or a problem with scale/sludge in the plate to plate heat exchanger

T, June 2008
link Click here to see other fixes for Halstead Ace.