6 Reasons Why Your Furnace Keeps Shutting Off and How to Repair It

Your furnace keeps your family cozy during the chilly winter months, so it’s annoying when something is off. One frequent complaint is a furnace that endlessly turns on and shuts back off over and over. This problem is referred to as short cycling. It stresses equipment and may lead to expensive repairs or even premature breakdowns.

Short cycling can happen for varying reasons. Before you request furnace repair, research the probable causes and how to take care of the issue.

1. Filthy Air Filter

The HVAC filter traps airborne dust, hair and other substances that could cause problems for furnace. If you don’t change the filter often enough, it can get filthy and reduce the airflow. When this takes place, a safety device turns off the furnace to stop overheating. Check the filter, and if it’s dirty, get a new one. From now on, 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 closed or obstructed air vents. For recommended system balance and performance, keep all registers open, even in unoccupied rooms.

3. Dirty Blower Wheel

The furnace blower has blades that push air through the ductwork. If they are covered in dirt, the air won’t flow properly, leading to overheating and short cycling. Regularly changing the filter is the easiest approach 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. Ensure the thermostat is in heating mode and auto fan with the desired temperature shown on the screen. Try changing the batteries. Also, check whether the thermostat is in direct sunlight or near a heat source that could influence the temperature reading. If you have a smart thermostat, visit the manufacturer’s site for troubleshooting instructions.

5. Soot-Covered Flame Sensor

The flame sensor turns off the gas valve when no burner flame going. The sensor can’t detect the flame if it’s sooty, so the gas turns off prematurely and the furnace shuts off. Leave the job of cleaning a sooty flame sensor to a pro like Winnipeg Supply Service Experts.

6. Oversized Furnace

When it includes home comfort equipment, oversized isn’t always best. A larger system heats up your residence too rapidly, causing unpleasant temperature swings and short cycling. The only way to take care of this problem is to schedule new furnace installation.

If you attempt the resolutions suggested here and nothing has changed, it’s time to call in the Experts at Winnipeg Supply Service Experts. We’ll examine the situation, pinpoint the cause, and provide the necessary repair. Our goal is to bring back indoor comfort, energy efficiency and trustworthy furnace performance for the rest of the season. And our repairs are upheld by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to request HVAC repair, call us at 204-800-0613 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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