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

Your furnace keeps your you cozy during the harsh winter months, so it’s annoying when something isn’t quite right. One frequent issue is a furnace that continually kicks on and switches off all the time. This operating error is called short cycling. It stresses equipment and might cause pricey repairs or even earlier than normal replacement. 

Short cycling can be caused by for a few reasons. Before you schedule furnace repair, consider the potential causes and how to resolve the problem. 

1. Dirty Air Filter 

The HVAC filter traps airborne dust, hair and other debris that could cause problems for furnace. If you don’t change the filter regularly, it can become clogged and reduce the airflow. When this occurs, a safety mechanism shuts off the furnace to prevent getting too warm. Check the filter, and if it’s dirty, replace it. Going forward, change the filter every 30 to 90 days to keep your furnace from short cycling. 

2. Clogged Air Vents 

A dirty filter isn’t the only trouble that can restrict airflow and overheat your furnace. Walk around your residence and look for unopened or obstructed air vents. For recommended 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 caked with dirt, the air won’t travel right, creating overheating and short cycling. Regularly replacing the filter is the easiest approach to stop a dirty blower wheel. If the blades are already dirty, request furnace maintenance to have them cleaned. 

4. Faulty Thermostat 

Check your thermostat next. This is the cortex of your HVAC system and gives the furnace instructions on what to do. Double-check the thermostat is set to heating mode and auto fan with the desired temperature showing on the screen. Try replacing the batteries. Also, check whether the thermostat is in bright sunlight or near a heat source that could affect the temperature reading. If you have a smart thermostat, visit the manufacturer’s site for troubleshooting tips. 

5. Dirty 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 coated in soot, so the gas shuts off sooner and the furnace shuts down. Leave the job of cleaning a dirty flame sensor to a professional like Stevenson Service Experts. 

6. Oversized Furnace 

When it involves home comfort equipment, oversized isn’t always best. A bigger system warms up your residence too quickly, creating intolerable temperature swings and short cycling. The only way to take care of this situation is to schedule new furnace installation

If you try the solutions suggested here to no avail, it’s time to call in the pros at Stevenson Service Experts. We’ll review the situation, pinpoint the cause, and provide the necessary service. Our goal is to reintroduce indoor comfort, energy efficiency and dependable furnace performance for all season long. And our repairs are supported by a 100% Satisfaction Guarantee for a year.* For more information about furnace short cycling, or to request HVAC repair, call us 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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