Gas Furnace Burner Cycles On And Off

3 reasons your gas furnace is short cycling 1.

Gas furnace burner cycles on and off.

1 low airflow. If your furnace keeps turning on and off repeatedly it can be stressful at best and cold or downright uncomfortable at worst. During a cold snap the furnace won t heat the house to desired temps. First it is important to realize that a furnace which is short cycling as we call it in the business probably means that its safety features are working properly so breathe a sigh of relief.

They repeatedly cycle on and off only heating for 2 5 minutes. A professional hvac technician will identify your problem and offer the appropriate solution. When your furnace isn t actually heating though your furnace blower shouldn t be running at all. When your gas furnace s heat exchanger the part that heats your home s air overheats your furnace will shut down to protect it from further damage after the heat exchanger cools off it ll turn back on and continue in an endless cycle of overheating and then shutting off.

There are several indirect issues that cause low. You may have a gas furnace thats several years old yourself. If your furnace keeps shutting off it could be due to low airflow. This is commonly referred to as short cycling.

Short cycling or high limit rocking in a gas fueled furnace may be due to excessive gas pressure in turn caused by improper gas pressure regulation. Your blower should run constantly until the heating cycle ends. If the gas regulator delivers gas at a pressure higher than antcipated by the furnace design engineers the burner puts out too much heat the plenum overheats during the. Or even a furnace replacement if it s left for too long.

Below we go over some of the more common causes why this might be happening. In most cases it s best to hire a pro to examine your furnace. When your furnace is cycling on and off it s called furnace short cycling. Fixing a short cycling furnace requires working with electrical and gas systems which can result in serious injury to yourself your furnace and your home if handled incorrectly.

In normal operation your furnace blower fan should come on 1 5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. One of the most common issues in early winter are gas furnaces that wont stay running.