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

Your furnace keeps your home warm during the harsh winter months, so it’s disconcerting when something is off. One frequent situation is a furnace that continuously kicks on and switches off all the time. This problem is referred to as short cycling. It stresses your furnace and may cause pricey repairs or even early failure.

Short cycling can be the result of for several reasons. Before you request furnace repair, read about the probable causes and how to resolve the situation.

1. Clogged Air Filter

The HVAC filter traps airborne dust, hair and other substances that could cause problems for furnace. If you don’t change the filter often enough, it can become dirty and block the airflow. When this occurs, a safety device turns off the furnace to avoid getting too hot. Check 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 prevent 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 residence and be on the lookout for for unopened or obstructed air vents. For recommended system balance and performance, keep all registers open, even in empty rooms.

3. Dirty Blower Wheel

The furnace blower has blades that move air through the ductwork. If they are dirty, the air won’t travel properly, creating overheating and short cycling. Frequently replacing the filter is the easiest method to avoid 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 cortex of your HVAC system and instructs the furnace on what to do. Make sure the thermostat is set to heating mode and auto fan with the desired temperature shown on the screen. Try replacing the batteries. Also, check whether the thermostat is in bright sunlight or near a heat source that could impact the temperature reading. If you use a smart thermostat, go to the manufacturer’s site for troubleshooting tips.

5. Soot-Covered Flame Sensor

The flame sensor turns off the gas valve when no burner flame on. The sensor can’t detect the flame if it’s covered in soot, so the gas turns off too soon and the furnace shuts off. Leave the adjustment of repairing a faulty flame sensor to an Expert like Service Experts Heating & Air Conditioning.

6. Oversized Furnace

When it involves HVAC equipment, larger isn’t always right. A bigger system warms up your home too rapidly, leading to unpleasant temperature changes and short cycling. The only way to resolve this situation is to request new furnace installation.

If you go through the fixes we covered here and nothing has changed, it’s time to contact the pros at Service Experts Heating & Air Conditioning. We’ll review the situation, diagnose the cause, and do the necessary repair. Our goal is to reintroduce indoor comfort, energy efficiency and dependable furnace performance for the remainder of the season. And our work is upheld by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to request HVAC repair, reach us at 330-305-2799 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.