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

Your furnace keeps your house cozy during the harsh winter months, so it’s annoying when something is wrong. One routine situation is a furnace that continuously kicks on and switches off all the time. This issue is known as short cycling. It strains your heating system and might result in expensive repairs or even early failure.

Short cycling can be the result of for several reasons. Before you request furnace repair, read about the potential causes and how to take care of the situation.

1. Filthy Air Filter

The HVAC filter traps airborne dust, hair and other debris that could damage the furnace. If you don’t get a new filter frequently, it can eventually be clogged and reduce the airflow. When this happens, a safety mechanism turns off the furnace to avoid getting too hot. Pull Out the filter, and if it’s dirty, replace it. Going forward, change the filter every 30 to 90 days to stop your furnace from short cycling.

2. Blocked Air Vents

A dirty filter isn’t the only issue that can lower 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 empty rooms.

3. Dirty Blower Wheel

The furnace blower uses blades that distribute air through the ductwork. If they are dirty, the air won’t move properly, creating overheating and short cycling. Regularly putting in a new the filter is the simplest way to stop a dirty blower wheel. If the blades are already dirty, schedule furnace maintenance to have them cleaned.

4. Faulty Thermostat

Inspect your thermostat next. This is the brain of your HVAC system and tells the furnace what to do. Double-check the thermostat is in heating mode and auto fan with the desired temperature displayed 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, check the manufacturer’s site for troubleshooting instructions.

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 detect the flame if it’s sooty, so the gas switches off too soon and the furnace shuts down. Leave the adjustment of cleaning a sooty flame sensor to an Expert like Niagara Home Services by Enercare.

6. Oversized Furnace

When it comes to home comfort equipment, bigger isn’t always right. A bigger system adds warmth to your residence too fast, creating intolerable temperature changes and short cycling. The only way to fix this problem is to schedule new furnace installation.

If you try the resolutions we covered here to no avail, it’s time to reach the professionals at Niagara Home Services by Enercare. We’ll review the situation, diagnose the cause, and perform the necessary repair. Our goal is to restore indoor comfort, energy efficiency and reliable furnace performance for the remainder of the season. And our work is upheld by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to book HVAC repair, call us at 289-273-2229 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.