Home>Discussions>PLUMBING>Boiler won't shut down even when thermostat is off
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JAMES
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.

jkirk
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

JAMES
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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