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

Your furnace keeps your house comfortable during the frigid winter months, so it’s annoying when something isn’t quite right. One frequent situation is a furnace that continually kicks on and turns off all the time. This operating error is called short cycling. It stresses your furnace and might result in expensive repairs or even earlier than normal breakdowns.

Short cycling can be the result of for varying reasons. Before you request furnace repair, review the potential causes and how to take care of the issue.

1. Dirty Air Filter

The HVAC filter catches airborne dust, hair and other debris that could damage the furnace. If you don’t get a new filter regularly, it can eventually be dirty and decrease the airflow. When this takes place, a safety mechanism switches off the furnace to stop getting too hot. Pull Out the filter, and if it’s dirty, replace it. From here on out, install a new filter every 30 to 90 days to prevent your furnace from short cycling.

2. Blocked Air Vents

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

3. Dirty Blower Wheel

The furnace blower has blades that distribute air through the ductwork. If they are caked with dirt, the air won’t travel right, leading to overheating and short cycling. Routinely changing the filter is the simplest way 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 instructs the furnace on what to do. Double-check the thermostat is set to heating mode and auto fan with the desired temperature displayed on the screen. Try replacing the batteries. Also, check whether the thermostat is in direct sunlight or near a heat source that could affect the temperature reading. If you rely on a smart thermostat, go to the manufacturer’s site for troubleshooting tips.

5. Soot-Covered Flame Sensor

The flame sensor is responsible for turning off the gas valve when no burner flame on. The sensor can’t find the flame if it’s coated in soot, so the gas switches off sooner and the furnace turns off. Leave the work of repairing a faulty flame sensor to an Expert like Knochelmann Service Experts.

6. Oversized Furnace

When it comes to HVAC equipment, bigger isn’t always right. A larger system heats up your residence too rapidly, causing unpleasant temperature swings and short cycling. The only way to resolve this problem is to request new furnace installation.

If you go through the resolutions we mentioned here to no avail, it’s time to call in the professionals at Knochelmann Service Experts. We’ll review the situation, figure out the cause, and perform the necessary service. Our priority is to bring back indoor comfort, energy efficiency and dependable furnace performance for all season long. And our repairs are upheld by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to book HVAC repair, call us at 859-905-0834 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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