Central Air Blower Fan Won T Turn On

The fan limit switch may include a switch that manually keeps the fan running.

Central air blower fan won t turn on.

This can be caused by a number of things from bad capacitors and belts to a bad blower motor in general. If your thermostat is secured correctly to the wall this clicking sound shouldn t be very loud. If the air conditioner still won t work make the call. The first is that the blower won t turn on.

Test to make sure you are getting 24 to 28 volts ac between the g green and c com terminals on you fan center or control board. Those problems are explained at thermostat won t turn off. This is one of the most common and easy ways to know if your air conditioner blower motor is broken or not. Fan has trouble starting in some cases you can give the fan a kick start by pushing it with a stick and if this occurs there is likely an issue with the capacitor.

Fan will not come on in the on position or your fan will not come on when you turn the thermostat down in the air conditioning mode. Your system probably has a manual fan on switch on. Most thermostats control both central air and central heat. Other snafus such as a shorted thermostat wire can also cause the a c or warm air furnace fan to run continuously.

What causes a thermostat to malfunction. At the furnace or air conditioner air handler or blower unit. If your system turns on but the fan never does the problem is something you ll need to have a pro take a look at. Replace or clean the furnace filter.

Similarly if a fan won t turn when the power is on but will rotate freely when shut off it could be the sign of a bad motor bearing. If the condenser coils are coated with dust or debris use a garden hose to wash them off. Check the fuses in the disconnect box located outside near the condenser to make sure there s power. I would start by confirming that the blower fan will operate.

Make sure the switch on the side of the thermostat is set to cool instead of heat that will ensure that the proper mechanical system. I would continue diagnosis by watching the behavior of. This noise is caused by a part called a relay which opens and closes to turn your ac on and off.