Air Conditioning Unit Fan Keeps Running

What to check for if your air conditioning system is not working.

Air conditioning unit fan keeps running.

Chester sounds to me that the contactor for the compressor and outdoor fan motor is stuck closed. Keeping the fan on creates a more even distribution of heating and cooling circulating the air if you have cold or hot spots in your house like a bedroom above a garage. Adjusting the fan speed can solve the problem. In the auto position the fan should cycle on only when there is a call for cooling.

A layer of grime on the fan blades can also slow it down so again you may just need a good cleaning. The furnace fan runs when the a c is on. I see this alot in older furnace central air units. This is a frequent problem caused by the points arcing on start and stop they sometimes get welded closed.

It normally has two options auto and on. The most common cause of this problem is the fan switch on the thermostat. Pros to running fan on air conditioner continuously. At thermostat won t turn off.

Outside unit runs all time by. This should be done by a qualified hvac technician. At fan wont stop thermostat switch other snafus such as a shorted thermostat wire can also cause the a c or warm air furnace fan to run continuously. The fix is to replace the contactor.

To turn the blower fan off simply set your thermostat to the auto option. Less frequent starts and stops of the fan can reduce the stress from startup and potentially help extend it s lifespan. Details of checking the thermostat s fan auto off or fan on switch position when the furnace or air conditioning fan won t stop running are. Those problems are explained.

In the on position the fan will run continuously. If your furnace is a gas fired furnace and has a standing pilot light has a pilot flame burning 24 7 the heat of the pilot flame can trigger the fan control to turn the furnace fan on to evacute the heat from the pilot out of the furnace. Make sure your thermostat is turned down to a temperature that will allow the air conditioning system to come on if your outdoor unit is running listen to determine if the fan is the only thing running or is the compressor the refrigerant is what keeps the compressor running cool. The fan is also activated by heat.