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

Your furnace keeps your you cozy during the harsh winter months, so it’s annoying when something is wrong. One frequent complaint is a furnace that endlessly kicks on and shuts back off over and over. This operating error is called short cycling. It strains equipment and might lead to costly repairs or even premature failure.

Short cycling can be caused by for several reasons. Before you book furnace repair, research the potential causes and how to fix the issue.

1. Clogged Air Filter

The HVAC filter traps airborne dust, hair and other pollutants that could damage the furnace. If you don’t get a new filter frequently, it can eventually be filthy and reduce the airflow. When this occurs, a safety feature switches off the furnace to avoid 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. Blocked Air Vents

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

3. Dirty Blower Wheel

The furnace blower uses blades that distribute air through the ductwork. If they are covered in dirt, the air won’t flow properly, leading to overheating and short cycling. Frequently replacing the filter is the best method to avoid 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 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 bright sunlight or near a heat source that could influence the temperature reading. If you use a smart thermostat, visit the manufacturer’s site for troubleshooting tips.

5. Dirty Flame Sensor

The flame sensor switches off the gas valve when no burner flame going. The sensor can’t find the flame if it’s sooty, so the gas switches off too soon and the furnace shuts off. Leave the adjustment of fixing a sooty flame sensor to an Expert like D&K Home Services by Enercare.

6. Oversized Furnace

When it includes HVAC equipment, bigger isn’t always right. A larger system warms up your home too quickly, causing unpleasant temperature changes and short cycling. The only way to fix this situation is to do new furnace installation.

If you go through the resolutions we mentioned here to no avail, it’s time to call in the pros at D&K Home Services by Enercare. We’ll review the situation, diagnose the cause, and provide the necessary repair. Our priority is to reintroduce indoor comfort, energy efficiency and reliable furnace performance for the remainder of the season. And our work is backed by a 100% Satisfaction Guarantee for a year.* For more information about furnace short cycling, or to book HVAC repair, call us at 613-707-2421 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.