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

Your furnace keeps your family cozy during the frigid winter months, so it’s annoying when something is wrong. One frequent complaint is a furnace that continually turns on and turns off all the time. This problem is known as short cycling. It stresses your furnace and may result in costly repairs or even early breakdowns.

Short cycling can be the result of for varying reasons. Before you request furnace repair, research the likely causes and how to take care of the situation.

1. Filthy Air Filter

The HVAC filter traps airborne dust, hair and other debris that could damage the furnace. If you don’t replace the filter frequently, it can become filthy and reduce the airflow. When this occurs, a safety mechanism switches off the furnace to prevent getting too warm. Pull Out the filter, and if it’s dirty, get a new one. Going forward, change the filter every 30 to 90 days to keep your furnace from short cycling.

2. Blocked Air Vents

A dirty filter isn’t the only issue that can restrict airflow and overheat your furnace. Walk around your house and be on the lookout for for shut or obstructed air vents. For adequate system balance and performance, keep all registers open, even in empty rooms.

3. Dirty Blower Wheel

The furnace blower consists of blades that move air through the ductwork. If they are caked with dirt, the air won’t move properly, causing overheating and short cycling. Regularly putting in a new the filter is the simplest way to avoid 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 brain 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 putting in new batteries. Also, check whether the thermostat is in full sunlight or near a heat source that could affect the temperature reading. If you have a smart thermostat, go to the manufacturer’s site for troubleshooting instructions.

5. Dirty Flame Sensor

The flame sensor turns off the gas valve when no burner flame going. The sensor can’t sense the flame if it’s coated in soot, so the gas switches off prematurely and the furnace turns off. Leave the adjustment of repairing a sooty flame sensor to a pro like Freschi Service Experts.

6. Oversized Furnace

When it involves heating and cooling equipment, oversized isn’t always better. A bigger system warms up your residence too rapidly, creating intolerable temperature changes and short cycling. The only way to resolve this issue is to request new furnace installation.

If you go through the resolutions we mentioned here and you’re still having problems, it’s time to call in the professionals at Freschi Service Experts. We’ll review the situation, diagnose the cause, and provide the necessary service. Our aim is to restore indoor comfort, energy efficiency and reliable furnace performance for the remainder of the season. And our repairs are supported by a 100% Satisfaction Guarantee for a year.* For more information about furnace short cycling, or to schedule HVAC repair, reach us at 925-384-1303 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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