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halstead ace high?

the boiler will fire up for a few seconds and then go off both on dhw and ch
cornish, December 2011
I had a similar fault, the air sampling spout at the top of the unit was broken, there has to be an air flow across the switch, I am not an expert this is just my experience

bumble, January 2012
link Click here to see other fixes for Halstead Ace High.