I have a central air conditioner that cools fine. When I raise the temperature setting I can hear the unit outside click off yet when I place my hand in front of an inside vent I can still feel some air blowing. When I look outside the unit is silent and the fan on top is not spinning so I feel that the unit is off. Why does it seem air is still coming from my vents inside? Can it be a draft from them or is another fan perhaps still running even if the compressor is not? Even when I manually turn the until "off" on the thermostat I can still feel air blowing. Thanks!
2007-08-21 03:25:30 · 8 answers · asked by AaronJones434 1 in Home & Garden ➔ Maintenance & Repairs
You may have a fan switch located on the furnace (Auto and Continuous/Manual).
This will over-ride the fan switch on the thermostat.
If it is set to continuous, your furnace fan will run constantly whether or not your a/c or heating is activated.
Placing the Furnace fan on continuous insures a more constant temperature throughout the house when cooling or heating.
If you place it on Auto, the fan will only come on when:
- the A/C is running
- a few minutes after the heating is comes on and will shut down a few minutes after the heating goes off. Regulated by an air temperature switch which is an integral part of the furnace.
If this is not the case, check on the thermostat for a fan switch. Set it to Auto if you do not want the fan to run continuously
If both of the above solutions do not stop the fan, it could be the Fan Relay as stated by another answer.
Have an Qualified HVAC Technician check this out.
Good Luck.
2007-08-24 18:30:48 · answer #1 · answered by Comp-Elect 7 · 1⤊ 0⤋
Make sure the fan switch is on AUTO. Look on yourr thermostat. You will see a switch that says FAN. If that doesn't work the read on.
Pull the cover off your thermostat and unscrew the front part. Pull it off to where you just see the wiring connections and see if it stops. This will break all connection to the fan control circuit through the thermostat. If it DOES stop replace the thermostat.
If it doesn't stop then the fan relay is probably stuck. If you have a board in your furnace then it might be bad. It might also be the low speed fan. Some people jump out their low speed fan control in the furnace to keep air circulating at all times. It's not going to be anything major. If it has a board in it then turn off the switch on the side of the furnace for a few minutes then turn it back on. See what happens. Try to determine if it's the low speed or high speed fan.
Some systems have a fan relay and some have a board.
2007-08-21 10:47:41 · answer #2 · answered by Anonymous · 2⤊ 0⤋
If you check the thermostat to make sure it is set automatic and the blower continues to run then the problem is most likely a bad blower relay or a bad circuit board. After checking the thermostat to ensure the fan selector switch is in the automatic position, versus the manual position, and the blower continues to run I would call a professional to replace the relay or the circuit board whichever you may have in your air handler.
2007-08-24 16:51:59 · answer #3 · answered by HVACMan 2 · 0⤊ 0⤋
If you do wind up working on your thermostat, be careful about making contact between any 2 points (the terminals), you could short out the transformer that is connected to the unit. Always disconnect the transformer while working on the thermostat...and then remember to reconnect it when you are done with your work. A question: did YOU install the thermostat? if so, did you EXACTLY follow the color/terminal setup of the old thermostat? The installation instructions always say to tag or make note of which color of wire was connected to which terminal on the thermostat, i.e., to ignore the natural inclination to wire green to G, yellow to Y, etc.
2007-08-21 11:20:37 · answer #4 · answered by Dept. of Redundancy Department 7 · 0⤊ 0⤋
Check the thermostat controls to see if there are separate fan controls. Most units have a selector to allow you to run the circulation fan all of the time or have it follow the cooling unit.
2007-08-21 10:34:04 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Many AC units are also routed through the furnace. Utilising the furnace fan to force the air through the vent system. Possibly that fan pushing the air after theoutside unit has shut off.
2007-08-21 10:36:56 · answer #6 · answered by Anonymous · 0⤊ 0⤋
you may have a unit that constantly circulates the air and cools it when it needs to only
you may be able to find this out by reading your owners manual or if you know your make model , call your local repair shop and they may be able to tell you what your model does
You could have a problem with the main control unit on the a/c or a thermastat that is defective
2007-08-21 10:32:54 · answer #7 · answered by chris v 1 · 0⤊ 0⤋
The fan relay needs to be replaced. It is closed and is keeping the circulating fan on all the time. The part costs about $20.
2007-08-21 10:39:06 · answer #8 · answered by mechnginear 5 · 0⤊ 1⤋