Why Does My Heater Keep Turning Off?
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Why Does My Heater Keep Turning Off?

A furnace provides a convenient and reliable way to stay warm during a North Carolina winter. However, several common issues can leave you out in the cold. If your furnace keeps shutting off, it’s important to identify the cause and have it resolved as quickly as possible. Learn why your furnace may not stay on and how to restore efficiency and optimize performance.

Reasons Your Furnace is Short Cycling

Short cycling is when your furnace turns off and on repeatedly. This can shorten the life of your HVAC system and increase your energy costs. During normal operation, the unit cycles on when the thermostat calls for heat. It turns off again after reaching the designated temperature.

Preventive annual maintenance is one of the best ways to avoid furnace repair. This service includes the inspection, cleaning, and tuning of your furnace.

Many common problems may cause a furnace to short-cycle. Here are just a few of the issues we see most often:

Restricted Airflow

A lack of airflow can cause the heat exchanger to overheat. This, in turn, trips the high-limit switch and shuts off your furnace as a safety measure. Reasons for poor airflow include:

Dirty air filter

When a dirty filter blocks airflow, the blower can’t suck in enough air to cool down the heat exchanger.

Closed or blocked supply or return vents

Closed vents or vents blocked by curtains, furniture, or other items can easily affect airflow.

This can also affect the performance of certain types of blowers.

Dirty blower wheel

Over time, dirt can accumulate on the wheel, slowing down air production.

Faulty Thermostat

It may be time to reprogram your smart thermostat to accommodate the changes in fall and winter temperatures. Heat-producing items, such as lamps, can also affect temperature readings if they are too close to the thermostat.

Improperly Sized Furnace

A furnace that is too large for your home may short-cycle. The experts at AnyDay Heating & Cooling will properly size your furnace replacement to maximize performance and efficiency.

Bad Limit Switch on Furnace

What is a furnace limit switch? This component, also known as a furnace high-limit switch, shuts off the blower once the desired temperature is reached. If it’s broken, your heating system may repeatedly trip on and off or run continuously.

HVAC System Malfunction

More serious issues include:

  • Dirty flame sensor
  • Cracked heat exchanger
  • Malfunctioning inducer
  • Circuit board malfunction

One of our licensed HVAC technicians can quickly find the issue. We will discuss with you whether furnace repair or replacement is the best option.

Comprehensive Heating Services in the Garner & Cary Areas

The licensed professionals at AnyDay Heating & Cooling have been providing quality furnace installation, maintenance, and repair services since 2004.

Call us today at 919-329-2944 to schedule service, or contact us online and let us know how we can help.

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