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

Your furnace keeps your you warm during the harsh winter months, so it’s frustrating when something isn’t quite right. One routine issue is a furnace that endlessly switches on and turns off all the time. This issue is called short cycling. It overworks your heating system and might lead to expensive repairs or even early replacement.

Short cycling can be the result of for varying reasons. Before you schedule furnace repair, research the potential causes and how to fix the issue.

1. Filthy Air Filter

The HVAC filter catches airborne dust, hair and other substances that could cause problems for furnace. If you don’t replace the filter frequently, it can get filthy and block the airflow. When this occurs, a safety feature shuts off the furnace to prevent overheating. Inspect the filter, and if it’s dirty, install a new one. From here on out, install a new filter every 30 to 90 days to keep your furnace from short cycling.

2. Obstructed Air Vents

A dirty filter isn’t the only trouble that can lower airflow and overheat your furnace. Walk around your home and look for unopened 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 has blades that move air through the ductwork. If they are dirty, the air won’t move properly, causing overheating and short cycling. Frequently putting in a new the filter is the simplest method to stop a dirty blower wheel. If the blades are already dirty, schedule furnace maintenance to have them cleaned.

4. Faulty Thermostat

Examine 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 on heating mode and auto fan with the desired temperature showing on the screen. Try changing the batteries. Also, check whether the thermostat is in full sunlight or near a heat source that could affect the temperature reading. If you have a smart thermostat, check 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 covered in soot, so the gas switches off too soon and the furnace shuts off. Leave the work of fixing a faulty flame sensor to an Expert like Comfortech Service Experts .

6. Oversized Furnace

When it includes home comfort equipment, larger isn’t always right. A bigger system heats up your home too rapidly, leading to uncomfortable temperature changes and short cycling. The only way to resolve this situation is to request new furnace installation.

If you try the solutions suggested here to no avail, it’s time to reach the professionals at Comfortech Service Experts . We’ll examine the situation, figure out the cause, and provide the necessary service. Our priority is to restore indoor comfort, energy efficiency and trustworthy furnace performance for the remainder of the season. And our services are backed by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to schedule HVAC repair, reach us at 601-852-3105 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.

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