6 Reasons Why Your Furnace Keeps Shutting Off and How to Resolve It

Your furnace keeps your home warm during the chilly winter months, so it’s annoying when something is wrong. One routine situation is a furnace that continually turns on and shuts back off again. This operating error is known as short cycling. It stresses your heating system and could lead to expensive repairs or even earlier than normal failure.

Short cycling can be the result of for a few reasons. Before you book furnace repair, consider the likely causes and how to take care of the situation.

1. Dirty Air Filter

The HVAC filter attracts airborne dust, hair and other debris that could cause problems for furnace. If you don’t get a new filter often enough, it can eventually be clogged and block the airflow. When this happens, a safety feature shuts off the furnace to avoid getting too warm. Check the filter, and if it’s dirty, get a new one. From now on, install a new filter every 30 to 90 days to keep your furnace from short cycling.

2. Obstructed Air Vents

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

3. Dirty Blower Wheel

The furnace blower uses blades that push air through the ductwork. If they are covered in dirt, the air won’t flow right, creating overheating and short cycling. Frequently changing the filter is the simplest method to prevent a dirty blower wheel. If the blades are already dirty, book furnace maintenance to have them cleaned.

4. Faulty Thermostat

Inspect your thermostat next. This is the brain of your HVAC system and instructs the furnace on what to do. Make sure the thermostat is on heating mode and auto fan with the desired temperature shown on the screen. Try changing the batteries. Also, check whether the thermostat is in bright sunlight or near a heat source that could influence the temperature reading. If you rely on a smart thermostat, check the manufacturer’s site for troubleshooting tips.

5. Soot-Covered Flame Sensor

The flame sensor turns off the gas valve when no burner flame going. The sensor can’t sense the flame if it’s sooty, so the gas turns off too soon and the furnace shuts down. Leave the job of cleaning a faulty flame sensor to an Expert like D.A. Bennett Service Experts.

6. Oversized Furnace

When it involves HVAC equipment, larger isn’t always better. A bigger system heats up your home too rapidly, causing intolerable temperature fluctuations and short cycling. The only way to resolve this problem is to do new furnace installation.

If you try the fixes we mentioned here and you’re still having issues, it’s time to contact the Experts at D.A. Bennett Service Experts. We’ll examine the situation, figure out the cause, and do the necessary repair. Our goal is to restore indoor comfort, energy efficiency and trustworthy furnace performance for the remainder of the season. And our services are backed by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to request HVAC repair, reach us at 518-205-3324 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