Inside AC fan always on - even when system is off.
#1
Member
Thread Starter
Join Date: Jun 2015
Location: United States
Posts: 7
Upvotes: 0
Received 0 Upvotes
on
0 Posts
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!
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!
#2
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.
#4
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).
We will await the make and model of the air handler (inside unit).
#5
Member
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 16,321
Received 38 Upvotes
on
30 Posts
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.