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Why is my furnace fan not shutting off?

Godfrey Franecki ∙

Lvl 10

∙ 1mo ago

Updated: 2/20/2025

Your furnace fan may not be shutting off due to a faulty thermostat, a malfunctioning fan limit switch, or a problem with the fan relay. It is recommended to contact a professional HVAC technician to diagnose and fix the issue.

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∙ 1mo ago

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Q: Why is my furnace fan not shutting off?

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Related Questions

What is the function of a furnace fan limiter switch and how does it impact the operation of the furnace fan?

The furnace fan limiter switch is a safety device that regulates the temperature of the furnace by controlling when the fan turns on and off. It prevents the furnace from overheating by shutting off the fan if the temperature gets too high. This helps protect the furnace from damage and ensures safe operation.

Why is my furnace blower not shutting off?

Your furnace blower may not be shutting off due to a faulty thermostat, a malfunctioning limit switch, or a problem with the fan control board. It is recommended to contact a professional HVAC technician to diagnose and fix the issue.

Why is my furnace not shutting off?

Your furnace may not be shutting off due to a malfunctioning thermostat, a clogged air filter, or a problem with the furnace's limit switch. It is recommended to contact a professional HVAC technician to diagnose and fix the issue.

My Oil furnace keeps shutting off I just refilled with oil?

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What is the function of a fan limit switch in a furnace and how does it regulate the operation of the fan?

The fan limit switch in a furnace controls when the fan turns on and off based on the temperature inside the furnace. It regulates the operation of the fan by monitoring the temperature and activating the fan when the furnace reaches a certain temperature and turning it off when the temperature decreases.

Why is my furnace blower not shutting off and not producing heat?

Your furnace blower may not be shutting off and not producing heat due to issues with the thermostat, the blower motor, or the furnace's control board. It is recommended to check these components and consult a professional HVAC technician for further diagnosis and repair.

Why does my furnace keep shutting off?

Your furnace may be shutting off due to a variety of reasons, such as a dirty air filter, a malfunctioning thermostat, a blocked vent, or a problem with the ignition system. It is recommended to have a professional HVAC technician inspect and diagnose the issue to ensure proper functioning of your furnace.

The electric fan won't shut off?

fan on my furnace will not shut off. smash it up then

Why does my furnace keep shutting off intermittently?

Your furnace may be shutting off intermittently due to issues such as a dirty air filter, a malfunctioning thermostat, a problem with the ignition system, or a blocked exhaust vent. It is recommended to have a professional HVAC technician inspect and repair your furnace to determine the exact cause of the issue.

Why won't the furnace fan turn off?

The furnace fan may not turn off due to a malfunction in the thermostat, a problem with the fan limit switch, or issues with the wiring. It is important to have a professional HVAC technician inspect and repair the furnace to ensure proper functioning.

Why does a home ac blow heat until it gets about 2 degress below what it's set for and it start's blowing cool air?

That is the function of the fan/limit control on your furnace. When the thermostat nears the point where the room temp setpoint is satified it shuts off the flame. The fan/limit control keeps the fan on for a minute or so to cool the furnace down before shutting off. Conversly, if your watch your furnace at start up you will see the flame lights first but the fan does not come on for a minute or so to allow the furnace to get hot and avoid blowing cold air into the home.

Why does my furnace keep shutting off and require resetting frequently?

Your furnace may be shutting off and requiring frequent resetting due to issues such as a dirty air filter, a malfunctioning thermostat, a clogged flue, or a problem with the ignition system. It is important to have a professional HVAC technician inspect and repair your furnace to ensure it operates safely and efficiently.

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