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

Your furnace keeps your you comfortable during the harsh winter months, so it’s annoying when something isn’t quite right. One common situation is a furnace that continuously switches on and shuts back off all the time. This operating error is known as short cycling. It stresses your furnace and might result in pricey repairs or even early failure. 

Short cycling can happen for several reasons. Before you book furnace repair, read about the potential causes and how to resolve the issue. 

1. Dirty Air Filter 

The HVAC filter catches airborne dust, hair and other substances that could cause problems for furnace. If you don’t change the filter regularly, it can become clogged and block the airflow. When this happens, a safety device turns off the furnace to prevent overheating. Pull Out the filter, and if it’s dirty, install a new one. Going forward, replace 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 thing that can lower airflow and overheat your furnace. Walk around your house and be on the lookout for for closed or crowded air vents. For proper system balance and performance, keep all registers open, even in unoccupied rooms. 

3. Dirty Blower Wheel 

The furnace blower consists of blades that distribute air through the ductwork. If they are dirty, the air won’t flow right, leading to overheating and short cycling. Frequently changing the filter is the simplest way to avoid 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 tells the furnace what to do. Double-check the thermostat is on heating mode and auto fan with the desired temperature shown on the screen. Try changing the batteries. Also, check whether the thermostat is in bright sunlight or near a heat source that could impact 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 switches 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 shuts off too soon and the furnace shuts down. Leave the adjustment of cleaning a dirty flame sensor to a pro like Stevenson Service Experts. 

6. Oversized Furnace 

When it comes to HVAC equipment, oversized isn’t always better. A larger system adds warmth to your residence too rapidly, leading to unpleasant temperature swings and short cycling. The only way to fix this issue is to schedule new furnace installation

If you attempt the fixes we mentioned here and nothing has changed, it’s time to call in the professionals at Stevenson Service Experts. We’ll review the situation, figure out the cause, and provide the necessary repair. Our aim is to bring back indoor comfort, energy efficiency and trustworthy furnace performance for all season long. And our work is 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 614-334-3192 today! 

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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. 

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