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Boiler will not shut off

My boiler has been working fine for a few years, recently it does not shut off form some reason and I have to do it manually I was hoping it was the thermostat but I bought this one last year. It might be the wiring I dont know. Help!! Dan

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  • Anonymous Nov 20, 2007

    Need a wiring diagram for the DUH1000 Utility heater

  • Anonymous Mar 13, 2008

    We have a Honey Well system, our hot water heat system developed a leak - repaired that & replaced water in lines - bled lines for air locks - but now temp on furnace will rise to 210 - shut system completely down - can anyone help.



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Boiler does not shut off when thermostat reaches temp, i already replaced aquastat but condition still exists

Posted on Nov 19, 2008

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Why does my boiler not shut off with time clock

Posted on Jan 04, 2010

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Boilers are controlled by a few things, one being a thermostat, secondly a zone valve or circulator control and thirdly by an Aquastat that controls the boiler temperature and safety shutoff. If one of those controls is sticking, your boiler will turn or remain on until it reached a temperature where the safety control shuts it off. If your boiler is not shutting off at all, most likely it is the Aquastat control. The Aquastat will be located on the boiler and may have "Honeywell" printed or stamped on it. Take off the front cover and you will find model numbers on the backside of the cover. If you have some mechanical skills, you could probably replace it. Turn off your power first and wire it wire per wire.
If your boiler is shutting off on high limit, I would suspect a stuck zone valve or circulator control or a bad thermostat or shorted thermostat wire.

Posted on Nov 15, 2007

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The boiler just wont stop leakin how do i shut it off

Posted on Dec 19, 2008

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2.) or are you asking what to test the water with?-- or WHY to be concerned with pH

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