Short cycling is a common problem that can significantly decrease the efficiency of your furnace and even cause damage to the unit itself. In this article, we will explore the most common causes of a short cycling furnace and how to troubleshoot them. Keep reading to learn more!

Ask a professional about short cycling.

Short cycling is a common problem with furnaces, and it can be caused by several different issues. Short cycling occurs when the furnace turns on and off rapidly, even before the house has been heated to its desired temperature. This causes inefficient use of energy as well as increased wear and tear on the equipment. Troubleshooting common short cycling furnace problems starts with taking some basic steps in order to identify potential causes of this issue: checking for proper airflow, inspecting connections, ensuring that there are no blockages in the air ducts or vents, confirming that all thermostat settings are correct, and more. Professional assistance should be sought immediately since ignoring this problem could lead to costly repairs down the road. Keep reading to find out how to troubleshoot your furnace when it’s short cycling.

Check to see if the pilot light is out or unstable.

Checking to see if the pilot light is out or unstable is an important step when troubleshooting common short cycling furnace problems. When a furnace’s light goes out, it can cause the unit to shut down and cycle on and off quickly. This can be due to air pressure in the line, worn-out parts, improper installation of components, or even environmental factors such as high humidity. It is therefore critical that you inspect your light regularly for any signs of instability or failure. To check if the light has gone out, turn off the power at the circuit breaker box before inspecting the unit’s flame sensor rod visually through its access panel. If there is no flame present, then make sure all valves are turned on and follow manufacturer instructions for relighting your furnace’s light with a long match or lighter. If this does not work, contact a licensed technician who can properly diagnose the issue.

Clean and adjust the pilot light assembly.

Cleaning and adjusting the assembly means removing any dirt or debris from around the flame so that it can burn evenly and at an optimal temperature. This also includes checking for any blockages in the fuel line that could be preventing proper airflow or fuel delivery into the combustion chamber, as well as making sure all connections are secure and free from corrosion or rust. Finally, you’ll need to make sure that any settings related to regulating how much air flows through the system are properly set according to manufacturer specifications; too little airflow can cause uneven burning of fuel which will lead to poor performance of your furnace over time. After cleaning and adjusting these components, you should see improved performance with fewer short cycling issues going forward.

Test safety switches, pressure switches, and ignition control modules.


When troubleshooting furnace problems, it’s important to check the safety switches, pressure switches, and ignition control modules for any defects. Safety switches are a critical component of the furnace as they provide a way to shut off gas or electricity if something goes wrong with the system. They should be checked first because if they aren’t working properly, then it can create a hazardous situation that needs to be addressed before any other issues are dealt with. Pressure switches measure the amount of pressure in different parts of your HVAC system and will turn off power if there isn’t enough airflow or too much air pressure present. This is necessary so your system doesn’t overheat which could lead to serious damage or even fire hazards. The ignition control module ignites fuel within your furnace and must also be checked when troubleshooting common short cycling problems; this includes ensuring proper current levels throughout all connections as well as checking for signs of wear like cracks in wires that may indicate an issue with an electrical resistance that could cause short circuits. Taking these three components into consideration when diagnosing short cycling issues can help you identify potential sources of trouble quickly.

Overall, troubleshooting common short cycling furnace problems is essential in order to maintain the efficiency and safety of the furnace. Proper maintenance and timely repairs can help to prevent any serious issues from arising and help to ensure the furnace is running at optimal performance.

By Manali