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The fan motor doesn't come on with the central air nor if I switch the fan switch to "ON". But the fan motor comes on if I switch to heating.

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This is an either - or.. thermostat or bad green wire . To find out ,go to the unit where the thermostat wires are, or the terminals strip ,and connect the red wire from the unit to the green. Or connect a jumper wire straight to the red to green terminal strip. and it should start. If does then the problem is the thermostat or the green wire so go from there!

Posted on Sep 03, 2008


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