Why Won’t My Furnace Shut Off in Decatur, IL?

A properly functioning furnace is a necessity during the winter months in Decatur, IL. The last thing you want to deal with is a constantly running furnace, which leads to higher energy bills. Here are several reasons why your furnace won’t shut off.

Temperature Is Set Too High

Your furnace will attempt to heat your entire home to the temperature set on your thermostat. When that temperature is set too high for your furnace’s capacity, the furnace will constantly run to try and reach that temperature.

Dirty Air Filter

A dirty air filter restricts airflow, causing a furnace to overheat. When this happens, your furnace’s fan will stay on in an effort to cool it down. Performing regular maintenance will help prevent this issue from becoming a bigger problem.

Malfunctioning Pilot Light

If you have a gas furnace, issues with the pilot light may be causing your furnace to stay on. The pilot light ignites the gas before sending it to the burner. If your furnace is not getting an adequate supply of gas, it will be unable to heat your home properly and continue to run as it tries to reach the set temperature.

Blocked or Closed Vents

Obstructed vents create an imbalance in your home’s airflow. When this happens, your furnace can have issues heating your entire home properly. Since the furnace cannot reach the set temperature, it constantly runs, attempting to catch up.

Faulty Limit Switch

The limit switch turns off your furnace once it reaches the desired temperature. When there is a damaged switch, your furnace may not realize it has already reached the set temperature and will continue to run.

There are many reasons why your furnace won’t shut off, including having your thermostat set too high, a dirty air filter, a malfunctioning pilot light, obstructed vents, and a fault limit switch. If you are dealing with a furnace that is having issues, contact us at Air King Inc. today to schedule an appointment to diagnose the problem.

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