6 Reasons Why Your Furnace Keeps Switching Off and How to Take Care of It

Your furnace keeps your family warm during the chilly winter months, so it’s frustrating when something is off. One frequent issue is a furnace that continuously switches on and shuts back off over and over. This problem is known as short cycling. It strains your heating system and might result in expensive repairs or even early breakdowns.

Short cycling can happen for a few reasons. Before you request furnace repair, research the potential causes and how to take care of the situation.

1. Filthy Air Filter

The HVAC filter attracts airborne dust, hair and other substances that could cause problems for furnace. If you don’t get a new filter regularly, it can become filthy and block the airflow. When this takes place, a safety mechanism turns off the furnace to avoid getting too warm. Check the filter, and if it’s dirty, install a new one. Going forward, replace the filter every 30 to 90 days to stop your furnace from short cycling.

2. Blocked Air Vents

A dirty filter isn’t the only trouble that can restrict airflow and overheat your furnace. Walk around your home and check for shut or crowded air vents. For proper system balance and performance, keep all registers open, even in unoccupied rooms.

3. Dirty Blower Wheel

The furnace blower consists of blades that move air through the ductwork. If they are covered in dirt, the air won’t move right, creating overheating and short cycling. Frequently replacing 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

Check your thermostat next. This is the core of your HVAC system and tells the furnace what to do. Double-check the thermostat is set to 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 influence the temperature reading. If you rely on a smart thermostat, check the manufacturer’s site for troubleshooting instructions.

5. Soot-Covered Flame Sensor

The flame sensor is responsible for turning 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 prematurely and the furnace shuts off. Leave the job of fixing a dirty flame sensor to an Expert like Pardee Service Experts.

6. Oversized Furnace

When it comes to home comfort equipment, oversized isn’t always best. An oversized system adds warmth to your home too quickly, leading to unpleasant temperature fluctuations and short cycling. The only way to resolve this situation is to do new furnace installation.

If you try the resolutions we mentioned here to no avail, it’s time to reach the pros at Pardee Service Experts. We’ll review the situation, figure out the cause, and provide the necessary work. Our priority is to reintroduce indoor comfort, energy efficiency and dependable furnace performance for the remainder of the season. And our repairs are supported by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to request HVAC repair, give us a call at 843-410-6103 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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