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

Your furnace keeps your house comfortable during the harsh winter months, so it’s annoying when something isn’t quite right. One frequent situation is a furnace that continuously kicks on and turns off all the time. This operating error is referred to as short cycling. It overworks your heating system and might result in expensive repairs or even early replacement.

Short cycling can be the result of for a few reasons. Before you book furnace repair, consider the likely causes and how to resolve the problem.

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 often enough, it can get filthy and reduce the airflow. When this takes place, a safety mechanism switches off the furnace to prevent getting too hot. Pull Out the filter, and if it’s dirty, replace it. Going forward, replace the filter every 30 to 90 days to prevent your furnace from short cycling.

2. Obstructed Air Vents

A dirty filter isn’t the only thing that can lower airflow and overheat your furnace. Walk around your house and look for shut or blocked air vents. For recommended system balance and performance, keep all registers open, even in unused rooms.

3. Dirty Blower Wheel

The furnace blower consists of blades that move air through the ductwork. If they are caked with dirt, the air won’t move correctly, causing overheating and short cycling. Regularly putting in a new the filter is the easiest way to stop a dirty blower wheel. If the blades are already dirty, book furnace maintenance to have them cleaned.

4. Faulty Thermostat

Examine your thermostat next. This is the cortex of your HVAC system and instructs the furnace on what to do. Make sure 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 have a smart thermostat, go to the manufacturer’s site for troubleshooting tips.

5. Soot-Covered Flame Sensor

The flame sensor turns off the gas valve when no burner flame is present. The sensor can’t detect the flame if it’s sooty, so the gas shuts off too soon and the furnace shuts down. Leave the work of cleaning a faulty flame sensor to a pro like Boehmers/Cronin Emery Home Services by Enercare.

6. Oversized Furnace

When it includes home comfort equipment, larger isn’t always better. A bigger system adds warmth to your residence too quickly, leading to intolerable temperature changes and short cycling. The only way to take care of this situation is to request new furnace installation.

If you go through the solutions we covered here and you’re still having issues, it’s time to reach the pros at Boehmers/Cronin Emery Home Services by Enercare. We’ll take a look at the situation, diagnose the cause, and perform the necessary work. Our goal is to bring back indoor comfort, energy efficiency and dependable furnace performance for the remainder of the season. And our services are supported by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to request HVAC repair, reach us at 519-804-1617 now!


*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.