Furnace Keeps Kicking On And Off

A properly sized furnace should turn on and off between three and eight times per hour deepening on the characteristics of your house outside air temperatures and other variables.

Furnace keeps kicking on and off. Dirty flame sensor rod. These are the most common causes of short cycling. 1 dirty air filter. Your furnace s heat exchanger needs that air blowing over it or it overheats causing the furnace to shut down.

Find out how to estimate which size furnace you need here. Why does my furnace keep turning on off. That s not to say there couldn t be another. If your furnace goes on and off too quickly it could be a dirty blower wheel.

There are 3 common reasons why a furnace keeps turning on and off. Heat exchanger is overheating due to low airflow. This is most common cause of short cycling. Typically a furnace keeps turning off and on or short cycling like this because of one of these problems.

The blower wheel has blades that push the air and if it has dirt on it it won t work as efficiently and might ultimately not work at all. If the furnace runs for a minute and then shuts off then its likely that a safety switch has tripped. Despite what you are told if your furnace is turning on and off more than eight times per hour.