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Mend Halstead Ace High Boiler Heating Dhw

I have a Halstead Ace high. ?

The DHW activation pin does not move enough to close the contacts on the DHW flow switch. If i operate the switch manually boiler fires ok. I have taken off the end where the pin come out but there is limited access. I have ordered a new diaphram but welcome any advice. Heating works fine

stget02
December 2011
it may be diaframe or poor circulation due to sludge

k
December 2011

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