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QUESTION:As it is now warming up, I've found a problem in the ac system at my
newly purchased home. It appears that basically any time the blower
is on, the gas furnace is running. The heat setting works fine. If
I turn on the AC, the compressor kicks on, but then like 30 seconds
later, the gas furnace also turns on. If the heat/cool setting is
turned to off, and I turn the fan to ON (instead of auto), the heat
also kicks on. I came home yesterday and it was literally 100F
upstairs!!! Any suggestions on how to troubleshoot the problem?
We've got a progammable thermostat and a Rudd gas furnance.
ANSWER: I would start by double checking the wiring to the thermostat at the
thermostat end *and* the furnace/ac end. If the mfg. was nice, they
will have a wiring diagram somewhere inside the furnace. Also it would
be nice to have the instructions/wiring diagram for the thermostat as
well. If you don't see any mis-wired connections, check the wire
itself to be sure there is not a short in it. Maybe someone drove a
nail through it and shorted one or more wires together. If you can't
see the wire because it is in the wall, then I would disconnect it at
both ends and use an ohm meter to test each wire against each other
wire to be sure there is no short. Note that this may have been
installed wrong and there could even be not enough wires run for this
setup - in which case you will need to run a new wire. If all of that
checks out OK, then I would call the furnace guy unless you know how
to troubleshoot the furnace itself.
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