HVAC Tips & Tricks

Why Does My Furnace Keep Turning Off?

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- By Jake gibson

When the temperature drops, you want your furnace working correctly to keep your home warm.

But what happens when it starts to switch off and on? This is called Short Cycling.

What Causes Short Cycling?

Short cycling refers to when your furnace frequently turns on and off, preventing it from keeping your home warm. Keep reading to check out the top 9 reasons why.

1. The Bad Flame Sensor

If your flame sensor isn't working, it won't sense a flame so will shut off your furnace. Keeping it clean will keep your furnace working in tip-top condition.

2. Overheating Furnace

Frequent overheating results in your furnace turning itself off to prevent potential damage. This is serious. Call an HVAC professional!

3. A Dirty Air Filter

A contaminated air filter prevents hot air from circulating throughout your home, resulting in short cycles and overheating. Replace it regularly.

4. Oversized Furnace

An oversized system can result in short cycling by unevenly distributing air. If this happens or your energy bills are higher than usual, check the size of your furnace.

5. Air Leaks

Insufficiently sealed windows and poor insulation prevent your furnace from producing enough air to heat your home correctly. Check your windows!

6. Clogged Exhaust Flue

Sometimes stuff can find its way into your exhaust flue. When the flue clogs, your furnace will shut down. Keep it clean and check it regularly.

7. Blocked Heat Grates 

As air flows through your furnace, the heat vents allow the warmth to circulate throughout your home. Keep them clear!

8. Thermostat Mounted in the Wrong Place

The location of your thermostat affects the heating capability of your furnace. Keep it out of direct sunlight and put it in a central location.

9. Blower Motor

The blower is responsible for circulating warm air in your home. When it breaks, your system cannot distribute the heated air. Time to call an HVAC professional.

Furnace Still Short Cycling?

Nothing worse than a malfunctioning furnace when it's cold outside. Generally, a short cycling furnace needs the support of a professional HVAC technician.

Hit Swipe Up! and learn more about how your furnace works and fix your heating problems like an HVAC professional.