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

Your furnace keeps your family cozy during the frigid winter months, so it’s disconcerting when something is off. One frequent situation is a furnace that endlessly switches on and switches off again. This issue is known as short cycling. It overworks equipment and could result in pricey repairs or even early failure.

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

1. Filthy Air Filter

The HVAC filter traps airborne dust, hair and other pollutants that could cause problems for furnace. If you don’t get a new filter frequently, it can eventually be clogged and block the airflow. When this happens, a safety device switches 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 trouble that can reduce airflow and overheat your furnace. Walk around your house and check for unopened or blocked air vents. For recommended system balance and performance, keep all registers open, even in unoccupied rooms.

3. Dirty Blower Wheel

The furnace blower consists of blades that move air through the ductwork. If they are dirty, the air won’t move properly, leading to overheating and short cycling. Routinely replacing the filter is the simplest approach to stop a dirty blower wheel. If the blades are already dirty, request furnace maintenance to have them cleaned.

4. Faulty Thermostat

Examine your thermostat next. This is the core of your HVAC system and tells the furnace what to do. Double-check the thermostat is set to heating mode and auto fan with the desired temperature showing on the screen. Try changing 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 guides.

5. Soot-Covered 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 sooty, so the gas shuts off too soon and the furnace shuts down. Leave the job of repairing a faulty flame sensor to a pro like Broad Ripple Service Experts.

6. Oversized Furnace

When it comes to heating and cooling equipment, larger isn’t always better. A larger system warms up your residence too rapidly, creating uncomfortable temperature swings and short cycling. The only way to fix this situation is to schedule new furnace installation.

If you attempt the resolutions we mentioned here and you’re still having issues, it’s time to call in the pros at Broad Ripple Service Experts. We’ll examine the situation, pinpoint the cause, and perform the necessary work. Our priority is to bring back indoor comfort, energy efficiency and trustworthy furnace performance for all season long. And our work is supported by a 100% Satisfaction Guarantee for a year.* For more info about furnace short cycling, or to request HVAC repair, call us at 317-527-0271 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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