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Old 10-03-2011, 05:05 PM   #1
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Furnace only runs sometimes


Furnace will come on and run fine sometimes. But does not always come on when it should. If you push the thermostat up to try and force it to come on it won't. If you set it on 70, sometimes when the temp drops it will come on, sometimes it won't. Bad thermostat? It works good when it comes on.

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Old 10-03-2011, 05:18 PM   #2
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Furnace only runs sometimes


remove the stat from the subbase see that R and W thats what the stat closes to run the heat..remove the W wire and touch it to the R the furnace should run if it short cycles or not at all it is the furnace....aas long as R/W it touching the furnace should run

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