FAQ

Quick Answer: Why does my gas furnace keep turning on and off?

Why does my furnace turn on and off repeatedly?

Why a Clogged Furnace Air Filter Can Cause Your Furnace to Turn On and Off Repeatedly. So, in essence, the most common causation for when a furnace keeps turning on and off, is a clogged air filter. Turn the furnace off, replace the air filter (with something quality), and turn it on again.

What does it mean when a furnace is short cycling?

A furnaceshort cycles” when it turns off before reaching the desired temperature. This means that if your thermostat is set to 72 degrees, the furnace may shut down at 65 or 68 degrees, but will never reach 72 degrees. Short cycling can also be used to describe a furnace that turns on and off too often.

How do I stop my furnace from short cycling?

Replace your air filter monthly to avoid blockage-related short cycling. Always consult your owner’s manual before changing your air filter, and make sure to install the right type and size. If you have any questions, don’t be afraid to call a furnace professional.

Is furnace short cycling dangerous?

Short cycling doesn’t necessarily pose a threat to your health, but it can absolutely destroy the furnace if it isn’t properly addressed in time.

Why do I have to keep restarting my furnace?

If a furnace isn’t receiving enough airflow, it may overheat and trigger the reset button to trip. Make sure to clean or replace the air filters and keep the air vents open enough for proper airflow. Occasionally, the flame sensor rod may be coated with dirt and debris, causing the furnace to shut off.

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How do I know if my furnace is short cycling?

Signs Your Furnace Is Short Cycling

  1. Thermostat Is Malfunctioning. If your thermostat is malfunctioning, it will give incorrect readings to your furnace.
  2. The Area Around the Furnace Is Hot. A furnace generates heat, so warmth around the unit is to be expected, but if it’s unusually hot near your furnace, the unit may be overheating.
  3. Short Bursts of Heat.

How do I know if my furnace thermostat is bad?

7 Signs You Need to Replace Your Thermostat

  1. Your HVAC Keeps Turning On or Off.
  2. Faulty Thermostat Readings.
  3. Suspiciously High Energy Bills.
  4. Constant Temperature Shifts.
  5. Thermostat Is Too Old.
  6. Thermostat Fails to Respond to Changed Settings.
  7. Your HVAC System Short Cycles.
  8. Know When to Replace Your Thermostat.

What is considered short cycling?

While the average air conditioning cycle lasts around 20 minutes, sometimes your air conditioning system can go through cycles too quickly—an issue known as “short cycling.” Short cycling is a term that means the air conditioner turns on and off in short bursts and does not heat or cool your house properly.

How often should a furnace turn on and off?

On average, furnaces should kick on and turn off anywhere from three to eight times per hour. However, if your furnace turns on and off more frequently, don’t assume the furnace is short cycling just yet.

Why is my furnace coming on every 5 minutes?

A dirty filter can cause the furnace to overheat. Short cycle time: 2-5 minutes. The key is that the furnace shuts off before your home is warmed. You might also notice hot air (warmer than usual) coming out of your heat grates.

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How do I stop short cycling?

How to Stop and Prevent Short Cycling

  1. Check your air filter. Believe it or not, a clogged air filter can cause a wide variety of air conditioning issues.
  2. Check your thermostat placement.
  3. Check your air conditioner’s refrigerant levels.
  4. Replace the low pressure control switch.
  5. Check the compressor.

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