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

Your furnace keeps your you cozy during the chilly winter months, so it’s disconcerting when something isn’t quite right. One routine issue is a furnace that continuously kicks on and shuts back off all the time. This problem is called short cycling. It stresses your heating system and might cause costly repairs or even early failure.

Short cycling can be caused by for varying reasons. Before you request furnace repair, read about the likely causes and how to fix the situation.

1. Clogged Air Filter

The HVAC filter catches airborne dust, hair and other substances that could wreak havoc on furnace. If you don’t replace the filter frequently, it can eventually be clogged and block the airflow. When this takes place, a safety feature shuts off the furnace to avoid getting too hot. Pull Out the filter, and if it’s dirty, install a new one. From now on, replace the filter every 30 to 90 days to prevent your furnace from short cycling.

2. Clogged Air Vents

A dirty filter isn’t the only thing that can reduce airflow and overheat your furnace. Walk around your residence and check for closed or crowded 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 travel properly, causing overheating and short cycling. Regularly changing the filter is the best approach to avoid a dirty blower wheel. If the blades are already dirty, schedule furnace maintenance to have them cleaned.

4. Faulty Thermostat

Check your thermostat next. This is the cortex of your HVAC system and tells the furnace what to do. Ensure the thermostat is in heating mode and auto fan with the desired temperature shown on the screen. Try replacing the batteries. Also, check whether the thermostat is in bright sunlight or near a heat source that could impact the temperature reading. If you use a smart thermostat, visit the manufacturer’s site for troubleshooting tips.

5. Dirty 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 shuts off prematurely and the furnace shuts down. Leave the work of cleaning a faulty flame sensor to an Expert like Komfort Air Service Experts.

6. Oversized Furnace

When it comes to HVAC equipment, oversized isn’t always better. An oversized system heats up your home too rapidly, causing unpleasant temperature changes and short cycling. The only way to resolve this issue is to do new furnace installation.

If you try the fixes suggested here and you’re still having issues, it’s time to call in the professionals at Komfort Air Service Experts. We’ll examine the situation, figure out the cause, and do the necessary service. Our goal is to bring back indoor comfort, energy efficiency and reliable furnace performance for all season long. And our work is supported by a 100% Satisfaction Guarantee for a year.* For more details about furnace short cycling, or to book HVAC repair, reach us at 704-705-8135 today!


*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.