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

Your furnace keeps your home cozy during the harsh winter months, so it’s frustrating when something is wrong. One routine complaint is a furnace that continually turns on and shuts back off all the time. This problem is called short cycling. It stresses equipment and might lead to expensive repairs or even earlier than normal failure.

Short cycling can happen for several reasons. Before you schedule furnace repair, research the potential causes and how to fix the issue.

1. Filthy Air Filter

The HVAC filter traps airborne dust, hair and other pollutants that could cause problems for furnace. If you don’t get a new filter regularly, it can become clogged and decrease the airflow. When this takes place, a safety feature switches off the furnace to stop getting too hot. Inspect the filter, and if it’s dirty, replace it. From now on, replace the filter every 30 to 90 days to keep your furnace from short cycling.

2. Clogged Air Vents

A dirty filter isn’t the only issue that can reduce airflow and overheat your furnace. Walk around your residence and be on the lookout for for unopened or blocked air vents. For recommended 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 dirty, the air won’t move properly, creating overheating and short cycling. Frequently changing the filter is the simplest way to avoid a dirty blower wheel. If the blades are already dirty, book furnace maintenance to have them cleaned.

4. Faulty Thermostat

Check your thermostat next. This is the core of your HVAC system and tells the furnace what to do. Ensure the thermostat is in heating mode and auto fan with the desired temperature showing on the screen. Try putting in new 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, go to the manufacturer’s site for troubleshooting guides.

5. Dirty Flame Sensor

The flame sensor switches off the gas valve when no burner flame going. The sensor can’t find the flame if it’s sooty, so the gas shuts off sooner and the furnace turns off. Leave the job of cleaning a dirty flame sensor to a professional like Falso Service Experts.

6. Oversized Furnace

When it includes heating and cooling equipment, oversized isn’t always better. A larger system adds warmth to your house too fast, leading to unpleasant temperature swings and short cycling. The only way to fix this issue is to schedule new furnace installation.

If you go through the resolutions suggested here and you’re still having issues, it’s time to call in the pros at Falso Service Experts. We’ll examine the situation, pinpoint the cause, and perform the necessary repair. Our goal is to reintroduce indoor comfort, energy efficiency and reliable furnace performance for the rest of the season. And our services are supported by a 100% Satisfaction Guarantee for a year.* For more information about furnace short cycling, or to book HVAC repair, give us a call at 315-313-6531 now!


*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.

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