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

Your furnace keeps your you warm during the chilly winter months, so it’s disconcerting when something is off. One frequent situation is a furnace that continuously kicks on and turns off over and over. This operating error is referred to as short cycling. It overworks your furnace and may lead to expensive repairs or even premature failure.

Short cycling can happen for several reasons. Before you schedule furnace repair, consider the possible causes and how to take care of the situation.

1. Dirty Air Filter

The HVAC filter traps airborne dust, hair and other substances that could cause problems for furnace. If you don’t replace the filter frequently, it can become filthy and decrease the airflow. When this occurs, a safety device shuts off the furnace to prevent overheating. Pull Out the filter, and if it’s dirty, install a new one. From here on out, install a new filter every 30 to 90 days to stop 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 house and look for closed or crowded air vents. For proper system balance and performance, keep all registers open, even in unused rooms.

3. Dirty Blower Wheel

The furnace blower uses blades that move air through the ductwork. If they are caked with dirt, the air won’t flow properly, causing overheating and short cycling. Frequently putting in a new the filter is the easiest method to avoid a dirty blower wheel. If the blades are already dirty, book furnace maintenance to have them cleaned.

4. Faulty Thermostat

Inspect your thermostat next. This is the core of your HVAC system and instructs the furnace on what to do. Ensure the thermostat is set to heating mode and auto fan with the desired temperature shown on the screen. Try replacing the batteries. Also, check whether the thermostat is in full sunlight or near a heat source that could impact the temperature reading. If you rely on a smart thermostat, go to the manufacturer’s site for troubleshooting guides.

5. Sooty Flame Sensor

The flame sensor switches off the gas valve when no burner flame on. The sensor can’t find the flame if it’s coated in soot, so the gas shuts off too soon and the furnace shuts down. Leave the adjustment of cleaning a faulty flame sensor to a pro like Strand Brothers Service Experts.

6. Oversized Furnace

When it includes heating and cooling equipment, bigger isn’t always right. A bigger system warms up your house too fast, creating unpleasant temperature swings and short cycling. The only way to take care of this situation is to schedule new furnace installation.

If you try the resolutions we went over here and you’re still having issues, it’s time to contact the professionals at Strand Brothers Service Experts. We’ll review the situation, pinpoint the cause, and provide the necessary service. Our goal is to reintroduce indoor comfort, energy efficiency and dependable furnace performance for all season long. And our services are supported by a 100% Satisfaction Guarantee for a year.* For more info about furnace short cycling, or to schedule HVAC repair, give us a call at 512-596-1257 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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