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Posted by John Gilmer on November 8, 2008, 9:12 pm
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> duradrinx had written this in response to
>
http://www.thestuccocompany.com/maintenance/Re-Old-Lennox-Furnace-Model-GH6-100T-maybe-thermostat-ma-165203-.htm
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> :
> I really hate to bump up a very old post. But I am having this exact
> issue.
> I had replaced my old mercury thermostat and shortly after this started
> happening to me. I had the furnace looked at 3 times, 2 differant
> companies. All three techs told me it has to be the thermostat. Well
> after trying 2 more thermostats, differant manufacturers. Nothing has
> changed.
> Did anyone find a solution to this?
I suggest you put back the old thermostat.
But one "clue" might be found by asking yourself how the thermostat gets the
power (I ASSume it is one of those electronic gadgets with a display.)
The old mercury thermostats are near idiot proof. They can even work on
"milivolt" system where the power to turn on the gas valve comes from a
thermopyle soaking in the pilot flame. If it just calls for heat it only
needs 2 wires. If it allow you to turn the fan on it only requires 3
wires. If there is an A/C with the furnace it only requires 1 more wire.
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> ""talking"" to each other properly.
>
> It seems that when I leave my thermostat alone it activates the
> furnance to go on when called upon. If I want to do a manual override
> on the thermostat it doesnt activate the furnace at all.
>
> The contact points on the control (in furnace) do seem greasy but is
> that enough to have my heating system behave in this way?
>
> Jack
>
> smbc99@aol.com
>
>