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BadAnimal
Dec 14, 2008, 08:42 PM
The fan in the attic is not blowing with the a/c on (the compressor will run outside) or if I just turn the fan to on on the thermostat.

However, it will run if I turn on the heater.

Suggestions??

Thanks!!
KC13
Dec 14, 2008, 09:19 PM
Most likely, something in the fan control circuit has failed (t-stat fan switch, fan relay, or wiring between the two). Heat relay usually controls fan in heating mode.
BadAnimal
Dec 15, 2008, 06:58 AM
Thank you for the quick reply!

And are those issues that you mentioned relatively inexpensive to have fixed?


Most likely, something in the fan control circuit has failed (t-stat fan switch, fan relay, or wiring between the two). Heat relay usually controls fan in heating mode.
KC13
Dec 15, 2008, 07:13 PM
Relative to cost of system replacement, yes. Relative to cost of lunch at McDonald's, no.