Why Won’t My Furnace Shut Off in Harrisburg, NC?

While you want your furnace to run enough to keep your home warm, a constantly running heating system is frustrating and inconvenient. If your Harrisburg, NC furnace won’t shut off, it’s likely because of one of these three issues.

Reduced Airflow

Several factors can diminish airflow, but clogged air filters are the most common. When your heating system has to work harder to push warm air throughout your home, the system runs longer. Clogged air filters not only lead to your furnace running longer, but they also can lower your indoor air quality.

Thermostat Problems

Your thermostat serves as the brains of your HVAC system, telling your furnace when to turn on and off. If your thermostat causes your system to run constantly, it’s probably because of a programming problem or a wiring issue.


Programming problems are easy to fix, as they usually mean that you’ve set your thermostat to a temperature that’s too high for your furnace to reach. Wiring issues are more serious and require the help of a professional HVAC technician. When there’s a loose connection or a damaged wire, the thermostat can’t send accurate information to the heating system.

Faulty Limit Switch

Your furnace has a limit switch that’s responsible for controlling the heat. When your thermostat sends a signal to the switch, telling it that it’s time to turn on the heat, the switch relays that message to the furnace. Conversely, this switch also tells it when it’s time to stop providing heat to your home.

If this switch malfunctions, there’s nothing to tell your furnace when to stop running. This results in it running constantly.

Your furnace should run enough to keep you warm before shutting off for a while. If your heating system isn’t doing that, call Dulin Mechanical Services, Inc., the best heating repair team in Harrisburg, NC.

Image provided by iStock

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