Forced Air Heating Fan Not Working

The first thing to do is check the relay or voltage from the board.

Forced air heating fan not working.

If the fan isn t running at all or there is. Then check your air filters and make sure they re not so dirty that airflow is restricted. There are a few ways to tell if your a c fan is temporarily or permanently out of order. Set it 5 degrees higher than normal during heating season and 5 degrees lower during cooling season.

If your home is heated with a forced air heating system a furnace or a heat pump is at the heart of it. Fan is not working. The big problems typically include noise and blockage of airflow usually caused by dirt or by furniture or draperies blocking the registers. On the chance that there is a shorted thermostat wire a problem that can also cause the a c or warm air furnace fan to run continuously.

Wait for at least 2 minutes as some thermostats have a decent delay between input and. Symptoms of a central a c fan not working. Determine whether another problem might cause the. There are a couple of ways to do this depending on your thermostat but the two most common are.

The first is an inspection of the outdoor unit to physically see if the fan is turning. Essentially blocking heating vents causes your furnace to work harder and longer than it is intended to work and can shorten its life. Blocking air increases the air pressure in your air ducts which may both cause and worsens airflow leaks particularly at joints and seams. When the blower fan won t start the problem could be something as simple as a blower compartment door that is not fully closed or a clogged condensate drain.

If there is a battery check if it is working properly. Here we look at how to handle furnace problems from a furnace working poorly to a furnace not working at all. This article series describes in detail the testing and diagnosis of problems with air conditioning fans and with forced warm air heating blower fans found in the air handler or ahu. Out fan limit switch installation wiring.

On the off chance that someone has inadvertently mis connected or shorted fan control wires at the fan limit switch also check. If no voltage is recorded you will have to replace the board or the relay. Turn heat to off then change fan from auto to on or some thermostats will have a fan only position. One of the most common problems with furnace fans is a bad blower relay.

There is little that can go wrong with a forced air system. Closed heat registers can cause other issues as well. For heat pump problems see heat pump troubleshooting repairs. Pros recommend keeping at least 80 percent of your heating registers open to prevent unnecessary air from building up in your furnace and ducts.

Extremely dirty air filters can sometimes cause your fan to stop working altogether.