Inside AC fan always on - even when system is off.

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  #1  
Old 11-04-16, 11:49 AM
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Inside AC fan always on - even when system is off.

Hello!

The inside fan on my central AC unit is ALWAYS on. The thermostat is set to "auto", but the fan never shuts off. The fan stays on even when the thermostat system is set to "off". The only way to get the fan to turn off is to flip the breaker. What could be the possible causes? I have a new air filter (the other one was a bit clogged), as of a few days ago and hasn't seemed to help the problem yet.

Thanks for the help!
 
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Old 11-04-16, 12:21 PM
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Without the make & model number, it's just a guess, however I would be suspicious of the blower relay (if there is one) or the air handler's control board. The condition of the air filter won't affect this problem.
 
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Old 11-04-16, 12:28 PM
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@Bob14525

Thanks. I can get make and model number later today.
 
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Old 11-04-16, 01:59 PM
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Since you are in Florida there is a good you have a heat pump system. That would mean you may have a defective sequencer relay that controls the electric reheat coils and the blower. This needs to be addressed ASAP as you may be paying for unneeded heat coming from your system.

We will await the make and model of the air handler (inside unit).
 
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Old 11-04-16, 02:02 PM
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In addition to the circuit board it could be a defective thermostat or a short circuit between the red and green wires in the thermostat cable. Rodents can chew on the cable and cause this damage. Some older furnaces had a "summer" switch on them that would cause the blower to run continuously when turned on. These switches were not always obvious, sometimes being a knurled shaft from the fan control unit.
 
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Old 11-12-16, 06:51 AM
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Sorry for the delay in response on this. Here's my make/model

Make: Payne
Model: PF-4MNB037
 
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