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themostat wont stop calling for heatSo I have a hydronic baseboard oil-fired heating system. Yesterday I turned the heat on for the first time this season.
I woke up this morning and it was way too hot. The t-stat was set to 66 and the room was 75. I went downstairs and the boiler was firing. I switched the t-stat off and the boiler shut off.
My system was 3 zone values (one is an indirect WH) and a single circulator pump? Any ideas what could be wrong or where i can start looking? |
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alphapointeDon't Touch Me MVM join:2002-02-10 Columbia, MO |
It's possible (if you have an old thermostat) that the contacts have welded shut. Might be time for a new 'stat. |
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lew_b Premium Member join:2003-05-11 Poughkeepsie, NY |
to LawnMowerGuy
If the other 2 zones were OK in terms of set temperature, I'd say check to see if the zone valve for the too hot area is stuck open. Push the lever on the valve all the way to open. If the t-stat is not calling for heat, the valve should spring back closed. If it doesn't then it's stuck open. Thereby heating that one zone any time the circ pump is running. Oops, missed the part about the t-stat. Never mind |
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to alphapointe
2 seasons ago I replaced the t-stats with programmable ones. The t-stats are the same model in my 2 zones. I'll swap these and see if i can replicate the problem on a different zone. |
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LawnMowerGuy |
to lew_b
At the time there was nothing else that would be kicking on the circulator pump. Is this still worth checking? |
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Zach Premium Member join:2006-11-26 Llano, CA |
to LawnMowerGuy
If switching the thermostat to 'off' shut system down, there isn't much else, besides the thermostat, that it could be. You might check the batteries if your thermostat has them. Many of the electronic stats will default to 'on' or use an internal bi-metal element to maintain heat if the batteries or unit fail. |
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to LawnMowerGuy
I have the other post on here "Circ pump wont shut off"......I think I found the problem, I ran some temporary thermostat wire and the problem hasnt appeared yet.......
Does your stat have batteries?
Good luck |
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tp0dyabbazooie Premium Member join:2001-02-13 Bulger, PA |
tp0d
Premium Member
2011-Oct-29 1:01 pm
Nuther vote for batteries.. should be done at the beginning of the heating season, -every- year
-j |
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Thanks, i changed the batteries and i *think* that may have solved the problem. |
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