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Why Does My Furnace Cycle On and Off Frequently

Does it seem like your furnace is always cycling on and off? A frequently cycling furnace could indicate several possible problems with the system, some of them requiring heater repairs. Here are some common reasons why a furnace cycles frequently.

Inadequate Airflow

If air isn’t flowing the way it should in an HVAC system, the furnace may cycle on and off frequently. Low airflow can be caused by:

  • Dirty filters
  • Blocked or closed air supply vents
  • A dirty or broken blower wheel

To avoid low airflow, make sure all vents are open and unobstructed and replace your filters every few months, more often if you have pets.

Oversized Furnace

While bigger may sound better in many situations, an oversized furnace or air conditioner is not better. An oversized furnace will heat the home more quickly, causing the system to short cycle. This will cause problems for the furnace in the long run, as it will succumb to wear and tear sooner, so make sure when you get a new furnace that it’s correctly sized.

The Thermostat is Bad

If your furnace is short cycling, the problem might not be with the furnace at all. Your home’s thermostat controls the entire heating system, so a faulty one could cause frequent cycling by sending skewed temperature messages to the furnace. This might be fixed by replacing the batteries or moving it out of direct sunlight, but it might require a technician’s help to fix.

Faulty Flame Sensor

In gas furnaces, a faulty flame sensor could be the route of short cycling problems. The flame sensor is there to cut off the gas supply if the flame goes out, which keeps gas from accumulating and becoming dangerous. However, a corroded or dirty sensor may not register the flame and will cause the furnace to shut down prematurely, a problem that requires professional help.

Lee’s Air Conditioning, Heating and Plumbing is the best choice for furnace replacement and repairs. Our expert technicians will work quickly to find the source of the problem and recommend a solution. If you need furnace repair, contact us today to schedule an appointment.

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What Our Customers Say

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Vikki H.

Knowledgeable and Competent

Michael McGowan was a knowledgeable and competent technician in fixing our furnace. We would definitely request him again if service is needed. Lee’s has provided maintenance for our AC and furnace the last few years and we are always more than satisfied.

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Leslie W.

Excellent Customer Service

Lee’s Air is professional, knowledgeable, and provides excellent customer service. They arrive on time, patiently address all questions, and go the extra mile to maintain customer satisfaction. I highly recommend them to anyone looking for quality and professionalism in a business choice.