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  1. #1

    Unhappy Boiler won't shut down even when thermostat is off

    I have a HB Smith gas boiler model # GB100W. It is a two zone heating system. When both thermostats are shut off the boiler will continue to run. I have changed out the Honeywell relay control center R8285D-1026 and the problem still exist. Yesterday I changed the Honeywell L4080b-1253 Aquastat controller and I am still having the problem:confused. Any suggestions would be appreciated. Thanks in advance.

  2. #2
    Join Date
    Mar 2008
    Location
    nova scotia, canada
    Posts
    1,522

    Default Re: Boiler won't shut down even when thermostat is off

    i had this problem 3 years ago in my old apartment before i bought a place, the thermostat to the boiler itself was defective so it didnt know when it was at temperature. it ran full out non stop until a plumber came in to fix the ordeal. best bet get a plumber in, as this isnt really a diy project
    fire up the saw and make some dust

  3. #3

    Smile Re: Boiler won't shut down even when thermostat is off

    I changes the aquastat and it seems that it was the culprit. I also ran new wire from the downstairs thermostat to the boiler. Everything seems to be working fine now.

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