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

Your furnace keeps your house comfortable during the chilly winter months, so it’s disconcerting when something isn’t quite right. One routine complaint is a furnace that continually turns on and turns off over and over. This problem is known as short cycling. It overworks your furnace and may result in pricey repairs or even premature breakdowns.

Short cycling can happen for a few reasons. Before you schedule furnace repair, review the probable causes and how to take care of the situation.

1. Dirty Air Filter

The HVAC filter catches airborne dust, hair and other debris that could wreak havoc on furnace. If you don’t get a new filter often enough, it can eventually be filthy and reduce the airflow. When this occurs, a safety mechanism turns off the furnace to prevent getting too warm. Check the filter, and if it’s dirty, install a new one. Going forward, change the filter every 30 to 90 days to stop your furnace from short cycling.

2. Obstructed Air Vents

A dirty filter isn’t the only thing that can reduce airflow and overheat your furnace. Walk around your home and be on the lookout for for shut or crowded air vents. For adequate system balance and performance, keep all registers open, even in unoccupied rooms.

3. Dirty Blower Wheel

The furnace blower uses blades that push air through the ductwork. If they are covered in dirt, the air won’t travel correctly, causing overheating and short cycling. Routinely replacing the filter is the easiest method to prevent 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 brain of your HVAC system and instructs the furnace on what to do. Double-check the thermostat is set to heating mode and auto fan with the desired temperature showing 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 rely on a smart thermostat, go to the manufacturer’s site for troubleshooting instructions.

5. Sooty Flame Sensor

The flame sensor is responsible for turning off the gas valve when no burner flame on. The sensor can’t find the flame if it’s covered in soot, so the gas shuts off sooner and the furnace shuts down. Leave the job of cleaning a dirty flame sensor to a pro like Service Experts Heating & Air Conditioning.

6. Oversized Furnace

When it includes HVAC equipment, oversized isn’t always better. A larger system adds warmth to your home too quickly, creating unpleasant temperature fluctuations and short cycling. The only way to resolve this issue is to request new furnace installation.

If you attempt the fixes we went over here and you’re still having problems, it’s time to reach the Experts at Service Experts Heating & Air Conditioning. We’ll take a look at the situation, pinpoint the cause, and provide the necessary service. Our priority is to bring back indoor comfort, energy efficiency and dependable furnace performance for all season long. And our work is upheld by a 100% Satisfaction Guarantee for a year.* For more information about furnace short cycling, or to request HVAC repair, call us at (713) 352-7887 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.