HeatingHelp! My Heater Keeps Turning On and Off!


Short cycling is a problem that many homeowners encounter with their heaters in the Puget Sound area. This is when a heater starts up but does not run for a full cycle before shutting back down. When we are in the midst of the coldest weather of the year, the last thing that you want is to realize that your heater is not working precisely as it ought to. Unfortunately, there truly is no such thing as a 100% reliable heating system. If you notice trouble with your heater such as the heater turning and off, you should call us right away to have the problem professionally resolved.

Reasons why you may encounter your heater turning on and off. 

Dirty Air Filters

We’ve advised you in the past about just how vital it is to keep a clean air filter in your HVAC system. If you use a forced-air heating system, be it a furnace or a heat pump, a dirty air filter really can cause a number of serious problems. Including your heater turning on and off. While your air filter will be changed during routine maintenance by your technician, it is up to you to ensure that it is changed as needed between visits. Otherwise, heat can be trapped in the system, causing it to overheat, shut down, and short cycle.

Malfunctioning Components

Your thermostat is responsible for regulating the operation of your heater and for reading temperatures in your home. That’s how your system knows when to come on and shut off. Heaters also have limit switches, thermocouples, and other devices designed to protect your safety and the condition of the heater. If any of these components should malfunction, they can cause the heater to keep turning on and off.

Improper Size

This last one is a bit of a worst-case scenario. If your heater is just too big for your home, then it can bring temperatures up too quickly. That may not sound like that big of a problem. However, it leads to the interruption of the heating cycle, and that puts a lot of wear and tear on your system. It also drives up energy costs even as your comfort suffers.


If your heater is short cycling and you need a little help from the professionals, Click here to contact us or call 425.533.9058 to speak with one of our HVAC representatives right away! The heating & air conditioning experts for Seattle, Bellevue, Everett, and the greater Puget Sound area! #InstallitRight  #FixItFast


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