Gas Furnace Burner Cycles On And Off

You may have a gas furnace thats several years old yourself.

Gas furnace burner cycles on and off.

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. Below we go over some of the more common causes why this might be happening. 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. One of the most common issues in early winter are gas furnaces that wont stay running.

When your furnace is cycling on and off it s called furnace short cycling. During a cold snap the furnace won t heat the house to desired temps. They repeatedly cycle on and off only heating for 2 5 minutes. 3 reasons your gas furnace is short cycling 1.

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. A hvac professional was out and initially thought there may be a duc. If your furnace keeps shutting off it could be due to low airflow. When your furnace isn t actually heating though your furnace blower shouldn t be running at all.

There are several indirect issues that cause low. If your furnace keeps turning on and off repeatedly it can be stressful at best and cold or downright uncomfortable at worst. 1 low airflow. In most cases it s best to hire a pro to examine your furnace.

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. Or even a furnace replacement if it s left for too long. The burner will run for 5 minutes and shut off for about 2 minutes and then turn back on for 5 minutes while the fan runs continuously. Your blower should run constantly until the heating cycle ends.

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. 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.