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

Your furnace keeps your house warm during the chilly winter months, so it’s frustrating when something isn’t quite right. One frequent complaint is a furnace that continually turns on and shuts back off again. This problem is known as short cycling. It stresses equipment and could cause pricey repairs or even early failure.

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

1. Filthy Air Filter

The HVAC filter traps airborne dust, hair and other debris that could cause problems for furnace. If you don’t replace the filter regularly, it can become dirty and reduce the airflow. When this occurs, a safety device shuts off the furnace to avoid overheating. Pull Out the filter, and if it’s dirty, install a new one. From now on, get a new filter every 30 to 90 days to stop your furnace from short cycling.

2. Blocked Air Vents

A dirty filter isn’t the only thing that can reduce airflow and overheat your furnace. Walk around your home and look for unopened or crowded 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 move air through the ductwork. If they are covered in dirt, the air won’t move right, causing overheating and short cycling. Frequently putting in a new the filter is the easiest method to stop 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 instructs the furnace on 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 use a smart thermostat, visit the manufacturer’s site for troubleshooting tips.

5. Sooty Flame Sensor

The flame sensor is responsible for turning off the gas valve when no burner flame going. The sensor can’t sense the flame if it’s covered in soot, so the gas shuts off too soon and the furnace shuts off. Leave the adjustment of fixing a dirty flame sensor to a pro like Strand Brothers Service Experts.

6. Oversized Furnace

When it comes to home comfort equipment, oversized isn’t always right. A larger system adds warmth to your house too quickly, causing unpleasant temperature changes and short cycling. The only way to take care of this problem is to request new furnace installation.

If you attempt the fixes we covered here to no avail, it’s time to reach the professionals at Strand Brothers Service Experts. We’ll review the situation, figure out the cause, and provide the necessary service. Our priority is to reintroduce 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 schedule HVAC repair, give us a call at 512-592-3072 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.

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