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Thermostat is set to “circulate” mode
- If your thermostat is set to “circulate” mode, it will continue to run the fan even when the heating or cooling system is not actively heating or cooling the air. This setting is designed to help improve air circulation throughout your home.
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People also ask
Why is my furnace blower fan not working?
Why does my furnace fan run constantly?
Why does my furnace keep turning on and off?
When should a furnace fan turn on and off?
If your furnace fan won’t turn off, you most likely have one of these 3 problems: Your furnace fan limit switch is set to “manual override”. The fan limit switch is faulty and needs to be replaced. There’s a problem in your thermostat wiring. Unfortunately, you’ll need a professional to fix those last 2 problems.
Jan 28, 2022 · If you leave it, the blower continues to run, and the heat never kicks back on. The only way to get it to stop is to turn off the power to the furnace. The thermostat's fan is is set on "auto" not "on".
- The Furnace Blower is Set “On” The most common cause of a furnace fan running continuously is that the blower setting on your thermostat is set to “on.”
- The Thermostat is Automatically Turning the Fan On and Off. Another possible cause of your furnace fan running continuously is that the thermostat itself is automatically turning the fan on and off.
- The Fan Limit Switch is in Manual Override Mode. In older HVAC units, the fan limit switch may be set to manual override mode. This means that the fan will run constantly until you manually turn it off.
- A Bad Thermostat. A faulty thermostat can cause your furnace fan to run constantly. Your thermostat should be checked for proper calibration, battery condition, and settings to ensure that it is working correctly.
Jan 20, 2023 · Leaky or poorly designed ductwork, an oversized furnace, or abnormally low or high heat exchanger temperatures can result in the blower fan constantly turning on and off. The Blower Turns On/Off Without the Furnace Running. A faulty fan limit switch is the most likely reason.
Aug 8, 2019 · Some newer thermostats (e.g. my ecobee3) can be set to run the fan a minimum of X minutes per hour even when heat/AC are off. Also, can you post the brand/model of your furnace; it may have electrical configuration options that cause the fan to run a set amount.
May 3, 2022 · On a natural gas or propane furnace, there are typically 6 main reasons why a blower fan motor may not shut off and just continues to run. Before turning the power off to the furnace or opening the doors to the furnace, check the LED status code light (if equipped) for any error codes.
This article describes what to check if the furnace or forced air blower fan does not stop when you expect it to do so. These same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C blower continues running.
