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

Your furnace keeps your you comfortable during the chilly winter months, so it’s frustrating when something isn’t quite right. One frequent issue is a furnace that endlessly switches on and shuts back off over and over. This issue is referred to as short cycling. It strains your furnace and may result in pricey repairs or even early breakdowns.

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

1. Filthy Air Filter

The HVAC filter catches airborne dust, hair and other pollutants that could damage the furnace. If you don’t change the filter regularly, it can eventually be clogged and decrease the airflow. When this occurs, a safety feature switches off the furnace to prevent getting too warm. Pull Out the filter, and if it’s dirty, get a new one. Going forward, 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 trouble that can lower airflow and overheat your furnace. Walk around your house and be on the lookout for for unopened or crowded air vents. For proper system balance and performance, keep all registers open, even in empty rooms.

3. Dirty Blower Wheel

The furnace blower consists of blades that distribute air through the ductwork. If they are covered in dirt, the air won’t travel correctly, leading to overheating and short cycling. Routinely replacing the filter is the simplest approach to stop 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 core of your HVAC system and instructs the furnace on what to do. Double-check the thermostat is in heating mode and auto fan with the desired temperature displayed on the screen. Try changing the batteries. Also, check whether the thermostat is in full sunlight or near a heat source that could impact the temperature reading. If you have a smart thermostat, check the manufacturer’s site for troubleshooting instructions.

5. Sooty Flame Sensor

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

6. Oversized Furnace

When it includes HVAC equipment, oversized isn’t always better. An oversized system adds warmth to your house too fast, creating uncomfortable temperature swings and short cycling. The only way to resolve this problem is to schedule new furnace installation.

If you attempt the solutions suggested here and nothing has changed, it’s time to call in the pros at Service Experts Heating & Air Conditioning. We’ll examine the situation, pinpoint the cause, and provide the necessary work. Our goal is to restore indoor comfort, energy efficiency and dependable furnace performance for all season long. And our work is supported by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to book HVAC repair, call us at 330-236-4793 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.