6 Reasons Why Your Furnace Keeps Turning Off and How to Fix It

Your furnace keeps your you cozy during the harsh winter months, so it’s disconcerting when something isn’t quite right. One routine situation is a furnace that continuously turns on and shuts back off over and over. This issue is referred to as short cycling. It strains equipment and could result in expensive repairs or even premature replacement.

Short cycling can happen for several reasons. Before you request furnace repair, consider the probable causes and how to take care of the issue.

1. Clogged Air Filter

The HVAC filter catches airborne dust, hair and other pollutants that could damage the furnace. If you don’t change the filter frequently, it can become dirty and decrease the airflow. When this occurs, a safety mechanism switches off the furnace to avoid getting too warm. Pull Out the filter, and if it’s dirty, replace it. From now on, install a new filter every 30 to 90 days to keep your furnace from short cycling.

2. Blocked Air Vents

A dirty filter isn’t the only issue that can restrict airflow and overheat your furnace. Walk around your house and be on the lookout for for closed or blocked air vents. For adequate system balance and performance, keep all registers open, even in unused rooms.

3. Dirty Blower Wheel

The furnace blower has blades that move air through the ductwork. If they are dirty, the air won’t flow properly, causing overheating and short cycling. Routinely changing the filter is the easiest method to prevent a dirty blower wheel. If the blades are already dirty, request furnace maintenance to have them cleaned.

4. Faulty Thermostat

Inspect your thermostat next. This is the core of your HVAC system and tells the furnace what to do. Ensure the thermostat is set to heating mode and auto fan with the desired temperature displayed on the screen. Try changing the batteries. Also, check whether the thermostat is in bright sunlight or near a heat source that could impact the temperature reading. If you have a smart thermostat, check the manufacturer’s site for troubleshooting guides.

5. Sooty Flame Sensor

The flame sensor is responsible for turning off the gas valve when no burner flame on. The sensor can’t sense the flame if it’s sooty, so the gas turns off too soon and the furnace turns off. Leave the adjustment of repairing a sooty flame sensor to a professional like Stallion Heating Plumbing Air Conditioning.

6. Oversized Furnace

When it comes to home comfort equipment, larger isn’t always right. A larger system heats up your house too quickly, causing unpleasant temperature fluctuations and short cycling. The only way to take care of this situation is to request new furnace installation.

If you try the resolutions suggested here and you’re still having problems, it’s time to contact the Experts at Stallion Heating Plumbing Air Conditioning. We’ll examine the situation, pinpoint the cause, and provide the necessary work. Our goal is to restore indoor comfort, energy efficiency and dependable furnace performance for the rest of the season. And our repairs are backed by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to book HVAC repair, reach us at 215-278-9690 right away!


*Not applicable to the Advantage Program. See your signed Advantage Program Agreement for full details and exclusions. 100% Satisfaction Guarantee is subject to certain restrictions and limitations as set forth in the applicable Terms and Conditions.

chat now widget box