Why does my furnace blower keep running?

You’re using the wrong thermostat fan setting. Your fan limit switch is on “manual override” There’s a shorted thermostat wire. There’s a shorted wire at the fan limit switch.

Why is my fan not turning off?

The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. Double-check the thermostat and make sure the fan is not set to ON, and that it still runs when switching it to AUTO or OFF (if your thermostat has an OFF setting).

How do I reset my Lennox blower motor?

How to Find and Reset your Furnace Motor Blower

1. Step 1: Turn off the power to the furnace.
2. Step 2: Remove the blower compartment cover.
3. Step 3: Make sure the blower is completely cooled off.
4. Step 4: Locate the reset button.
5. Step 5: Press the button in (assuming that this is your issue and that the button has popped).

Why won’t my furnace stop running?

If your furnace won’t shut off, you likely have one of the following problems: Incorrect setting on thermostat. Dirty air filter. Broken blower fan motor.

How long should a furnace blower run?

In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. Your blower should run constantly until the heating cycle ends.

Is it OK to run furnace fan constantly?

Running your furnace fan all the time isn’t exactly a bad thing. In fact, there’s no need to worry about the fan wearing out or breaking down because it’s designed to run continuously, and there’s an array of benefits connected to this. Here are some of them: Better circulation of heated and cooled air.

How long should fan run after AC turns off?

Your HVAC fan should turn on and off with the rest of your heating and cooling system. It’s normal for the fan to kick on a couple of minutes before heating starts or to stay on for a couple of minutes after cooling stops, but your fan shouldn’t run for hours on its own.

Do all furnace blower motors have a reset button?

All furnaces are equipped with a reset button. They are generally red or yellow and are located inside the blower compartment. The reset button is a safety feature that will shut down the furnace when a problem is detected, often a hot or overheating furnace, before it trips the circuit breaker.

Is there a reset on a Lennox furnace?

If your system overheats or experiences a similar malfunction, you can simply reset your furnace. Here are the 4 steps needed to reset your Lennox furnace, Find your electrical panel and switch the breaker that controls your furnace, and have it up and running again in seconds.

What do you do when your furnace won’t turn off?

Check Your Thermostat If your furnace wont shut off and you’re worried, don’t panic. The first thing to do is check the thermostat. Check whether your fan is set to On or Auto. If it’s On, try setting it to Auto — this will turn the fan off when the temperature reaches the desired setting.

Will a furnace run without a thermostat?

Thermostat controls: Without power, there’s no way for your thermostat to communicate to your furnace that it’s time to turn on! The circuit board controlling the furnace from the thermostat will not work otherwise, even if it runs on batteries.

Why is my furnace blower not working?

One of the most common problems with furnace fans is a bad blower relay . The first thing to do is check the relay or voltage from the board. If no voltage is recorded, you will have to replace the board or the relay. If there is a battery, check if it is working properly. This is another common reason behind faulty blower fans.

Why is your furnace not working?

Dirty air filters are often the culprit behind an inefficiently performing furnace. That’s because air filters trap dust, dirt and debris like hair, which over time can restrict or block vital air flow, overheating the heat exchanger and preventing your furnace from working as it should.

Why is my AC blower not working?

A common problem behind an air conditioner blower not starting includes overheating, which keeps the motor from running. Let your air conditioner rest and cool down for a while before trying to turn it on again; if the motor works at that point, overheating is probably the problem.

Why is my furnace not blowing out hot air?

Furnace Not Blowing Hot Air – Problems & Solutions The reason your furnace is not blowing hot air could be a setting on the thermostat, a circuit breaker, or a clogged air filter. Other potential problems include a bad blower fan or limit control switch.