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

Your furnace keeps your family warm during the chilly winter months, so it’s frustrating when something isn’t quite right. One common situation is a furnace that continuously kicks on and switches off again. This issue is called short cycling. It overworks equipment and could result in expensive repairs or even early breakdowns.

Short cycling can be caused by for a few reasons. Before you request furnace repair, review the potential causes and how to fix the problem.

1. Dirty Air Filter

The HVAC filter attracts airborne dust, hair and other pollutants that could wreak havoc on furnace. If you don’t get a new filter frequently, it can eventually be clogged and block the airflow. When this happens, a safety feature shuts off the furnace to avoid getting too warm. Inspect the filter, and if it’s dirty, install a new one. From now on, get a new filter every 30 to 90 days to prevent your furnace from short cycling.

2. Blocked Air Vents

A dirty filter isn’t the only thing that can restrict airflow and overheat your furnace. Walk around your residence and check for closed or crowded air vents. For proper 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 travel right, causing overheating and short cycling. Routinely replacing the filter is the simplest approach to stop a dirty blower wheel. If the blades are already dirty, schedule furnace maintenance to have them cleaned.

4. Faulty Thermostat

Inspect your thermostat next. This is the core of your HVAC system and gives the furnace instructions on what to do. Make sure the thermostat is in heating mode and auto fan with the desired temperature displayed on the screen. Try changing the batteries. Also, check whether the thermostat is in direct sunlight or near a heat source that could affect the temperature reading. If you use a smart thermostat, visit the manufacturer’s site for troubleshooting tips.

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 sooty, so the gas shuts off sooner and the furnace shuts down. Leave the adjustment of fixing a sooty flame sensor to a professional like Roy Inch & Sons Home Services by Enercare.

6. Oversized Furnace

When it involves home comfort equipment, oversized isn’t always better. A bigger system adds warmth to your home too rapidly, causing intolerable temperature fluctuations and short cycling. The only way to fix this problem is to schedule new furnace installation.

If you go through the solutions we went over here to no avail, it’s time to call in the Experts at Roy Inch & Sons Home Services by Enercare. We’ll review the situation, diagnose the cause, and provide the necessary service. Our goal is to restore indoor comfort, energy efficiency and trustworthy furnace performance for all season long. And our repairs are supported by a 100% Satisfaction Guarantee for a year.* For more information about furnace short cycling, or to book HVAC repair, call us at 226-270-1164 today!


*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.