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hot water wont heat up,halstead ace high 0086?

boiler running 4 heating,but valve wont kick in, to heat hot water.the pin in the valve wont come out to make contact with the switch. possible air lock? or sensor ?
roger, February 2008
boil is sequencing but not firing up?

leonard, December 2010
sounds like domestic diaphragm perished, easy to replace. If you make the contact yourself through the micro switch does the boiler ignite? if yes definately diaphragm.

Big A, February 2008
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