6 Reasons Why Your Furnace Keeps Switching Off and How to Solve It

Your furnace keeps your family cozy during the frigid winter months, so it’s disconcerting when something is off. One common complaint is a furnace that continuously turns on and shuts back off again. This problem is referred to as short cycling. It strains equipment and could lead to expensive repairs or even premature failure.

Short cycling can happen for several reasons. Before you request furnace repair, consider the probable causes and how to fix the situation.

1. Clogged 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 regularly, it can become filthy and decrease the airflow. When this occurs, a safety mechanism shuts off the furnace to avoid getting too hot. Pull Out the filter, and if it’s dirty, get a new one. From here on out, install a new filter every 30 to 90 days to stop your furnace from short cycling.

2. Blocked Air Vents

A dirty filter isn’t the only thing that can reduce airflow and overheat your furnace. Walk around your home and be on the lookout for for unopened or crowded air vents. For recommended 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 correctly, leading to overheating and short cycling. Regularly changing the filter is the easiest approach to prevent a dirty blower wheel. If the blades are already dirty, schedule furnace maintenance to have them cleaned.

4. Faulty Thermostat

Inspect your thermostat next. This is the core of your HVAC system and instructs the furnace on what to do. Ensure 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 direct 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 guides.

5. Sooty Flame Sensor

The flame sensor turns off the gas valve when no burner flame is present. The sensor can’t find the flame if it’s sooty, so the gas switches off too soon and the furnace shuts down. Leave the job of repairing a dirty flame sensor to an Expert like Jack Nelson Service Experts.

6. Oversized Furnace

When it comes to home comfort equipment, bigger isn’t always best. A bigger system heats up your house too fast, leading to unpleasant temperature swings and short cycling. The only way to resolve this issue is to schedule new furnace installation.

If you try the solutions suggested here and nothing has changed, it’s time to reach the professionals at Jack Nelson Service Experts. We’ll examine the situation, pinpoint the cause, and perform the necessary repair. Our priority is to reintroduce indoor comfort, energy efficiency and trustworthy furnace performance for all season long. And our repairs are backed by a 100% Satisfaction Guarantee for a year.* For more information about furnace short cycling, or to request HVAC repair, give us a call at 918-212-8927 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.

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