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Why does my furnace continue to run non-stop even when the thermostat is turned off?

Pedro Mitchell ∙

Lvl 10

∙ 1mo ago

Updated: 2/26/2025

There could be several reasons why your furnace continues to run non-stop even when the thermostat is turned off. It could be due to a malfunctioning thermostat, a problem with the wiring, or a faulty relay switch. It's important to have a professional HVAC technician inspect and diagnose the issue to ensure proper functioning and safety.

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Q: Why does my furnace continue to run non-stop even when the thermostat is turned off?

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Related Questions

Why does the furnace fan keep running even when the thermostat is turned off?

The furnace fan may keep running even when the thermostat is turned off due to a malfunction in the fan relay or a problem with the thermostat wiring. This can cause the fan to continue running independently of the thermostat setting.

Why does the furnace keep running even when the thermostat is turned off?

The furnace may keep running even when the thermostat is turned off due to a malfunction in the thermostat itself, a wiring issue, or a problem with the furnace's control board. It is important to have a professional HVAC technician inspect and repair the issue to ensure safe and efficient operation of the heating system.

Why is my furnace blowing air when it is turned off?

Your furnace may be blowing air when turned off due to a malfunction in the thermostat, a problem with the fan setting, or issues with the furnace's control board. It is recommended to contact a professional HVAC technician to diagnose and fix the issue.

Why wont your forced air furnace come on?

Here are some things to check. Is the thermostat turned up? Sounds silly but I went into many homes it was turned down, or the switch on the thermostat was turned to off Is the pilot lit? This assumes you have a standing pilot furnace. If it is spark ignition, does the park cycle start. Check all fuses and breakers

What is wrong if you turn the thermostat to off but the furnace is still running?

When you say the furnace is still running, I take that to mean the fan and not the actual flame portion of the furnace. If this is correct, you either have a fan relay that is sticking closed or your tstat is bad. == == == == There may be a very slight time delay the the thermostat before turning off the furnace, but if you are sure that you have turned the thermostat off and the fire continues to burn, you have a serious problem. Have it checked out. The gas valve may be sticking in the open position. Regards

Why is there no heat when thermostat turned on?

There could be several reasons for no heat when the thermostat is turned on, such as a faulty thermostat, a malfunctioning heater or furnace, a blown fuse or tripped circuit breaker, or a lack of fuel or gas supply to the heating system. It is best to consult a professional HVAC technician to identify and fix the issue.

Main burner on furnace burns all the time even with thermostat turned down a no electric signal to valve from thermostst?

Depends on what type of furnace you have but it sounds like 1.a wire from the thermostat is shorted, 2.the thermostat is stuck itself or 3. the main gas valve is stuck. Try turning the power off to the furnace next disconnect the wires leading to the gas valve if this stops it check 1 and two if this doesnt stop it then it is number 3

Why is my thermostat turned off but my HVAC system is still blowing air?

If your thermostat is turned off but your HVAC system is still blowing air, it could be due to a malfunction in the system's wiring or controls. This can cause the fan to continue running even when the thermostat is set to off. It's recommended to have a professional HVAC technician inspect and repair the issue to ensure proper functioning of your system.

What should I do if the blower is not working on my furnace?

If the blower is not working on your furnace, you should first check the power supply to the furnace and make sure it is turned on. If the power is on and the blower still isn't working, you may need to check the thermostat settings, the air filter, and the circuit breaker. If these steps don't solve the issue, it's best to contact a professional HVAC technician for further assistance.

Why wont my central heating start when the termostadt is turned up?

Furnace blower plugged in, to a live outlet? Fuel (natural gas or oil) is sufficient? If your thermostat has a battery, you may need to replace the battery; that happened to me last year.

Why would the central air not come on when turned on at the thermostat?

eihter the thermostat is messed up or you have a short in the wiring.

My central air continues to run after the unit is turned off. Is there anything that I can check before calling a dealer?

Yes, check to see that someone has not turned your thermostat Fan control to "ON" instead of "Auto." If it is set to "ON" then the furnace fan will remain on when the A/C has cycled off. NOTE: This happens more often than you would think.

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