Furnace Fan Not Working

Your furnace has safety controls that.

Furnace fan not working.

Start by turning the furnace off turn your thermostat to fan only and wait a few minutes. If the fan does not start you have a wiring issue circuit breaker trips or motor problem circuit breaker does not trip. This is a bad temperature sensor in the unit. After ruling out all of the simple problems above the most likely cause of a furnace not blowing air is a problem with the blower fan itself which if you remember is the fan that circulates your house s air over the heated coils.

Open blower compartment door a safety switch may be preventing fan operation. Adjusting the rise and fall of temperature can also help solve the problem. The first thing to do is check the relay or voltage from the board. For this case or if your blower fan or furnace fan won t start at all see.

If the fan motor does not start the furnace will overheat and the high temperature limit switch should cause the burners to shut off. See blower door safety switch. There are a couple of ways to do this depending on your thermostat but the. If you see or hear the fan turn on your blower motor is not the culprit.

To check your furnace s blower fan for proper operation start by turning your furnace to the off position. Furnace not working or wont turn on. Soot builds up on the heat exchanger over time making it even less efficient. In auto mode the furnace will heat up but the fan won t run the heater then reaches the hi limit and the system shuts down the fan never runs.

All this can easily cause the heat exchanger to overheat. If there is a battery check if it is working properly. It may be necessary to leave the fan in the on position so the heat can continue to operate until the problem is resolved. The blower fan is not working if the furnace isn t blowing air with any degree of warmth and the thermostat settings circuit breakers and air filter have all been ruled out as possible causes the problem could stem from the blower fan itself.

One diagnostic step that can be taken is to put the fan switch to the on position at the thermostat. Perhaps your blower motor has burnt out and you need a new one. One of the most common problems with furnace fans is a bad blower relay. Is your furnace not working or perhaps the furnace is turning on but only for a few seconds.

Imagine trying to run a marathon with a heavy cloth around your mouth and nose and you ll get the idea. No electrical power to the fan or its controls check for a blown fuse or heating or cooling switch set to off. Replace the fan limit controller. Next you will turn your thermostat to the fan only mode.

The furnace is suffocating without enough air so it has to work harder and run longer to heat your home. Check the afc automatic fan control for dust and other accumulation. Is your furnace blower motor not working and there is no air coming out of your vents. If the fan operates this would indicate that the problem is most likely something other than the fan motor itself.

This is another common reason behind faulty blower fans.