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.

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 start by confirming that the blower fan will operate. This noise is caused by a part called a relay which opens and closes to turn your ac on and off. If the air conditioner still won t work make the call.

Your system probably has a manual fan on switch 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. 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. But here are some suggestions to start troubleshooting the problem of a furnace blower fan that does not start.

Check the fuses in the disconnect box located outside near the condenser to make sure there s power. If you turn on your air conditioning system and find that there is no air blowing out of the ac unit or no buzz of the blower fan motor then it is possible the ac blower motor has an issue. Other snafus such as a shorted thermostat wire can also cause the a c or warm air furnace fan to run continuously. The first is that the blower won t turn on.

What causes a thermostat to malfunction. 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. 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.

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. This can be caused by a number of things from bad capacitors and belts to a bad blower motor in general. Replace or clean the furnace filter. If your thermostat is secured correctly to the wall this clicking sound shouldn t be very loud.

But if you hear a loud clicking noise andthe ac won t turn on it could mean the thermostat is malfunctioning. Most thermostats control both central air and central heat. If the condenser coils are coated with dust or debris use a garden hose to wash them off.