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

Your furnace keeps your family comfortable during the harsh winter months, so it’s annoying when something isn’t quite right. One routine issue is a furnace that endlessly kicks on and switches off over and over. This issue is known as short cycling. It stresses your furnace and might cause expensive repairs or even early failure. 

Short cycling can be the result of for a few reasons. Before you book furnace repair, read about the potential causes and how to resolve the situation. 

1. Filthy Air Filter 

The HVAC filter attracts airborne dust, hair and other pollutants that could wreak havoc on furnace. If you don’t change the filter regularly, it can get dirty and decrease the airflow. When this happens, a safety feature turns off the furnace to avoid getting too warm. Pull Out the filter, and if it’s dirty, install a new one. From now on, change the filter every 30 to 90 days to stop your furnace from short cycling. 

2. Clogged Air Vents 

A dirty filter isn’t the only issue that can lower airflow and overheat your furnace. Walk around your house and check for closed or crowded air vents. For proper system balance and performance, keep all registers open, even in unused rooms. 

3. Dirty Blower Wheel 

The furnace blower uses blades that move air through the ductwork. If they are dirty, the air won’t travel right, creating overheating and short cycling. Frequently putting in a new the filter is the best way 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 tells the furnace what to do. Make sure the thermostat is on 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 influence the temperature reading. If you have a smart thermostat, go to the manufacturer’s site for troubleshooting guides. 

5. Sooty 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 sooty, so the gas turns off prematurely and the furnace shuts off. Leave the job of repairing a dirty flame sensor to an Expert like Service Experts Heating & Air Conditioning. 

6. Oversized Furnace 

When it involves HVAC equipment, bigger isn’t always right. An oversized system warms up your house too quickly, causing uncomfortable temperature swings and short cycling. The only way to take care of this problem is to schedule new furnace installation. 

If you try the solutions we covered here and you’re still having problems, it’s time to reach the Experts at Service Experts Heating & Air Conditioning. We’ll examine the situation, pinpoint the cause, and provide the necessary repair. Our priority is to reintroduce indoor comfort, energy efficiency and trustworthy furnace performance for all season long. And our services 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 954-736-4314 right away! 

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*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.