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Thermastat and furnace

I have a very old thermastat and the cover isn't there anymore. The problem is about 1 month ago the furnace was turned on by mistake and no problem it came on. Now since it's cold I turned the thermastat on and it won't turn the furnace on. The pilot is lit. Please help

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Turn the power off to the furnace. Take your thermostat off the wall. Disconnect the red and white wire off the stat. Tie those 2 together. Turn the power to the furnace back on. If the heat comes on, the thermostat is bad. If it doesnt come on, then you may not have power to the stat. Possibly a bad transformer in furnace.

Posted on Sep 20, 2012

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You should have 24 volts between yellow and white wires at the stat when the stat is set to heat and set as hot as it will go. burners should light first then 3 to 5 minutes later the fan motor should fire up. if burner doesn't light check the wires going into the top of the gas valve see if you have 24 volts arriving there from the stat. if you do then the gasvalve is probably bad. you can bypass the action of the stat by jumping red to white on 90 percent of the stats made and in a few seconds the gas valve should click open gas flow to main burner where pilot ignites it. another easy check you can do is flip stat fan switch to on. fan should come on at once. if not then you have either no high voltage to unit or no low voltage ( as in a bad transformer). if the fan comes on you know you have high volts and low volts...by cover i assume you mean the decorative cover but there second cover with the mercury bulbs and all is still there. if you have only the bare subbase then new stat time. sounds like an old furnace if it has a standing pilot, it should be checked for cracked heat exchanger by a pro with a n electronic carbon monoxide detector. NOT a diy item due to the real danger of co poisoning.

Posted on Oct 09, 2008

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