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halstead best 40?

i'v got a halstead best 40 boiler. when i turn the boiler on at the spur, the pump starts and will keep going all the time. the only way it will stop is by turing of the boiler. the boiler works fine otherwise.
john, October 2009
had the same fault, you need to replace the aquastat pcb, about 115 pounds.

mike, March 2011
link Click here to see other fixes for Halstead.