Check for a short
by CndDomer (2012-12-30 08:35:51)
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  In reply to: Okay, electricians and handymen, explain this. [edit]  posted by Papa November

Check there isn't a short in the "R" cable between the jumper and the line. I had what sounds like this very same problem. The jumper was contacting the R line in two places, shorting out the control. With the thermostat set to where it should come on, I just jiggled the wires to find the short and then rewired it.


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