6 Reasons Why Your Furnace Keeps Shutting Off and How to Take Care of It

Your furnace keeps your you comfortable during the frigid winter months, so it’s frustrating when something is wrong. One common issue is a furnace that endlessly kicks on and shuts back off over and over. This issue is referred to as short cycling. It stresses your furnace and could lead to pricey repairs or even early replacement.

Short cycling can be caused by for a few reasons. Before you schedule furnace repair, review the probable causes and how to fix the situation.

1. Dirty Air Filter

The HVAC filter catches airborne dust, hair and other pollutants that could cause problems for furnace. If you don’t get a new filter regularly, it can eventually be dirty and reduce the airflow. When this takes place, a safety mechanism turns off the furnace to prevent getting too hot. Pull Out the filter, and if it’s dirty, replace it. Going forward, replace the filter every 30 to 90 days to stop your furnace from short cycling.

2. Blocked Air Vents

A dirty filter isn’t the only trouble that can restrict airflow and overheat your furnace. Walk around your residence and look for closed or blocked air vents. For recommended system balance and performance, keep all registers open, even in unused rooms.

3. Dirty Blower Wheel

The furnace blower has blades that distribute air through the ductwork. If they are caked with dirt, the air won’t travel correctly, creating overheating and short cycling. Routinely changing the filter is the simplest approach 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 gives the furnace instructions on what to do. Ensure the thermostat is set to heating mode and auto fan with the desired temperature displayed on the screen. Try replacing the batteries. Also, check whether the thermostat is in full sunlight or near a heat source that could affect the temperature reading. If you use a smart thermostat, check the manufacturer’s site for troubleshooting guides.

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 switches off too soon and the furnace shuts down. Leave the adjustment of fixing a dirty flame sensor to a pro like Bob Brown Service Experts.

6. Oversized Furnace

When it includes HVAC equipment, oversized isn’t always better. A bigger system adds warmth to your home too rapidly, causing unpleasant temperature fluctuations and short cycling. The only way to take care of this problem is to do new furnace installation.

If you attempt the solutions we went over here and you’re still having problems, it’s time to call in the professionals at Bob Brown Service Experts. We’ll examine the situation, diagnose the cause, and perform the necessary work. Our priority is to bring back indoor comfort, energy efficiency and dependable furnace performance for the rest of the season. And our work is upheld by a 100% Satisfaction Guarantee for a year.* For more information about furnace short cycling, or to schedule HVAC repair, give us a call at 623-243-4517 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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