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

Your furnace keeps your home warm during the harsh winter months, so it’s annoying when something is wrong. One frequent situation is a furnace that endlessly turns on and shuts back off all the time. This problem is called short cycling. It strains your heating system and may cause pricey repairs or even earlier than normal failure.

Short cycling can be caused by for a few reasons. Before you book furnace repair, research the probable causes and how to fix the problem.

1. Clogged Air Filter

The HVAC filter traps airborne dust, hair and other debris that could wreak havoc on furnace. If you don’t replace the filter frequently, it can become clogged and block the airflow. When this takes place, 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. Going forward, change the filter every 30 to 90 days to keep your furnace from short cycling.

2. Obstructed Air Vents

A dirty filter isn’t the only thing that can lower airflow and overheat your furnace. Walk around your residence and be on the lookout for for shut 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 consists of blades that push air through the ductwork. If they are covered in dirt, the air won’t flow right, causing overheating and short cycling. Frequently changing the filter is the best 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 cortex 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 displayed on the screen. Try changing the batteries. Also, check whether the thermostat is in direct sunlight or near a heat source that could impact the temperature reading. If you use a smart thermostat, check the manufacturer’s site for troubleshooting instructions.

5. Soot-Covered 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 turns off too soon and the furnace turns off. Leave the job of fixing a dirty flame sensor to a pro like Service Experts Heating & Air Conditioning.

6. Oversized Furnace

When it comes to HVAC equipment, oversized isn’t always right. A bigger system adds warmth to your residence too fast, causing unpleasant temperature swings and short cycling. The only way to take care of this problem is to do new furnace installation.

If you attempt the fixes we went over here and you’re still having problems, it’s time to reach the professionals at Service Experts Heating & Air Conditioning. We’ll take a look at the situation, pinpoint the cause, and do the necessary repair. Our priority is to reintroduce indoor comfort, energy efficiency and dependable furnace performance for the rest of the season. And our work is upheld by a 100% Satisfaction Guarantee for a year.* For more info about furnace short cycling, or to request HVAC repair, reach us at 866-397-3787 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.