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The reasons your furnace keeps shutting off are probably thermostat issues, clogged filters, faulty flame sensors, problems with the ignition, or blocked exhaust vents. To fix it, check thermostat settings, replace the filters, clean the flame sensors, clear vents, or call a pro.

A furnace that keeps shutting on and off continuously without working properly must be making you tired of searching for causes and solutions. If so, you have come to the right article! Here, you will learn all the most common issues and how to solve them. Start reading!

Why Does My Furnace Keep Shutting Off?

Your furnace most likely keeps shutting off due to thermostat issues, clogged filters, faulty flame sensors, problems with the ignition system, or even blocked exhaust vents and flues. Check the details below and repair the heating system today.

Thermostat Issues

Incorrect settings on the thermostat could lead to the furnace shutting off. Ensure that the thermostat is set to the desired temperature and mode (heat) and that the batteries, if applicable, are not dead.

Dirty Or Clogged Air Filters

Another possible reason your furnace burners keep shutting off is restricted airflow due to dirty or clogged air filters. They can cause the furnace to overheat and trigger a safety shut-off. Regularly change or clean the air filters to have a properly functioning furnace.

Faulty Or Dirty Flame Sensor

A flame sensor is a safety feature that detects the presence of a flame. If it is dirty or malfunctioning, it may not register the flame, causing the furnace to shut down. Cleaning or replacing the flame sensor may resolve this issue.

Problems With The Ignition System

If the furnace has a pilot light or an electronic ignition system, problems with ignition components could lead to the furnace shutting off. Faulty igniters, thermocouples, or pilot lights may need inspection or even replacement.

Blocked Exhaust Vent Or Flue

A blocked exhaust vent or flue can lead to improper ventilation, causing the furnace to shut down for safety reasons. Check for debris, bird nests, or ice accumulation and clear them if necessary. No matter the hot water heat system you have, vents should always be clean.

Once you know the causes, remember that one of the differences between heat pumps and furnaces is that the maintenance of the latter is a little more costly. However, doing it will save you more money than dealing with unplanned repairs!

Also, if you have an oil furnace that keeps shutting off and needs to be reset, try checking the oil level and filter, inspecting the fuel line, cleaning the oil burner nozzle, and inspecting the CAD cell sensor.

As oil furnaces have some specificities that require special attention, furnace issues are always better when dealt with by homeyou's professional heating contractors! Call them now!

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