What would cause a furnace to keep shutting off?

If your furnace keeps shutting off, it could be due to low airflow. There are several indirect issues that cause low airflow. Dirty Air Filters. If you don’t change your air filters often enough, the filters will become dirty and clogged, which means the heat exchanger retains heat and eventually causes it to overheat.

Why does my furnace keep on shutting off?

A flame sensor problem could be why your furnace keeps shutting off. The flame sensor is a safety device designed to turn off your furnace if no flames are detected, protecting you against dangerous gas fumes. If the flame sensor becomes corroded or covered in soot, it cannot detect flames, even when your furnace is running properly.

What’s the average time it takes for a furnace to turn off?

A full heating cycle for a furnace or heat pump is usually around 15 minutes or more. If your heater keeps turning off after only five minutes, that’s too short—no matter how low you’ve set the thermostat. This is one of the most frequent causes of trouble in an HVAC system.

Why does my furnace have a short cycle?

Now, if you want to learn more about these issues and why they cause the furnace to short cycle, read on. A common reason a furnace short cycles is because the heat exchanger, the part that heats your air, is getting too hot due to a lack of airflow .

Why is my heat exchanger not working in my furnace?

Check Your Furnace Filter – The most common cause of short cycling is a dirty or clogged air filter. If your filter is dirty, air cannot pass over the heat exchanger, causing the system to overheat and shut down prematurely.

How do you shut off a gas furnace?

Turn off the gas supply. The shut off valve for your furnace’s gas line is usually located near the pilot light itself. Turn the shut off valve so that it is perpendicular to the supply line, forming an L shape. This means that the gas supply to your pilot light is off, and you should see the flame disappear.

How often should my furnace turn on?

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. Despite what you are told, if your furnace is turning on and off more than eight times per hour,…

Why does gas furnace keep shutting off?

Sometimes a furnace keeps shutting off because the flame sensor is corroded or caked in soot. When operating normally, the flame sensor detects flames, and turns off the gas valve when there isn’t any. This prevents your home from filling up with harmful gas fumes, which has dangerous consequences.

Is your furnace turning on and off rapidly?

So, if your furnace keeps turning off and on too quickly, your thermostat might be malfunctioning or broken . There are several things that could be causing your thermostat to not work properly. The wiring could be old and need replacing, it might need new batteries, or it could be the location of your thermostat.