Why Does Your Furnace Run Constantly?

As the cold season approaches, your furnace needs to be in its best working condition to keep your family warm and comfortable. As such, watch out for signs of underlying furnace issues and repair the problems before they become a disaster.



One common problem that can beset your furnace is when the system starts to run constantly. A furnace that runs constantly is not only a waste of energy but could also signify a more significant problem that, if left unaddressed, could lead to a system breakdown. Discover the possible reasons behind a constantly running furnace and how you can fix the problem.

The Filter Is Dirty

A furnace filter's primary purpose is to clean the air circulating through your home. However, the component may clog with dirt, dust, and other debris.

When the filter has a blockage, air cannot pass through as efficiently. As a result, the furnace has to work harder to circulate air and meet your desired temperature. Unfortunately, this issue causes the system to run for extended periods, eventually leading to a complete breakdown.

To avoid this problem, clean or change the component regularly. The frequency of filter replacement depends on how often you use the system and the level of debris in your house. For instance, if you have pets, you may need to clean or replace the filter more often.

The Thermostat Is Incorrect

The thermostat is the brain behind the heating system. This component tells the furnace when to turn on and off, depending on the temperature you've set. If the thermostat does not work correctly, that can cause your furnace to run continuously.

You have a few ways to check if your thermostat is the problem. First, make sure that the thermostat is turned to heat mode and not cool. Then, check the temperature setting. If the setting is too low, the furnace will likely run non-stop, trying to offer the desired level.

The Blower Is Incorrect

The blower is the component that circulates air through your ductwork and into your home. If it fails, perhaps due to a tripped circuit breaker, the furnace will continue to run even if your home has reached the desired temperature.

Besides the system running constantly, you can tell if the blower is the culprit if you notice a weak airflow or if the furnace produces odd noises. However, a faulty blower is best left to a professional to repair due to the complex electrical wiring involved.

The Pilot Light Is Out

The pilot light helps to ignite the furnace. This process requires a small, steady stream of gas to maintain the flame. If the pilot light goes out, the furnace will not operate correctly.

Luckily, you can relight the pilot light on most furnaces without professional assistance. To do this, find the pilot light assembly on your furnace, and locate the knob or switch next to the pilot light. Then, turn off the gas supply to the furnace by rotating the knob to the off position.

Before relighting the pilot light, wait a few minutes for any residual gas to clear. First, hold a lighter to the opening of the pilot light assembly, then turn on the gas supply by rotating the knob back to the on position. You should see a small flame appear within a few seconds. If this step fails, you need professional assistance to fix the problem.

Central York Corporation is your go-to provider for all your residential heating maintenance and repairs. We have extensive experience in the industry, and our team of experts is readily available to help you with any issue, big or small. Contact us for more inquiries.