You can try turning the switch to OFF too.ĭetails of checking the thermostat's FAN-AUTO-OFF or FAN-ON switch position when the furnace (or air conditioning) fan won't stop running are Next: If the blower just keeps running no matter what, there are two places to check switch settings before calling your heating or air conditioning service company in response to a furnace fan or air conditioning fan that just keeps running without stopping:ġ.CHECK the FAN-AUTO setting - At the room thermostat: the FAN-AUTO-OFF or FAN ON/OFF switch on the room thermostat should be checked. If the equipment was running give it three to four minutes to shut down. You have told the thermostat to turn off the HVAC equipment. In the cooling season do the opposite - set the thermostat to its highest setting and confirm that room temperature is below that point.
In the heating season, just set the thermostat(s) to the lowest setting and confirm that room temperature is above that point. Other heating system problems that can cause a furnace (or boiler) to refuse to stop are givenįirst, confirm that the room thermostat is not calling for heating or cooling. These diagnostic steps are for an air handler, blower, or furnace fan that just won't quit running. What to Check if your Furnace Fan or Air Handler Blower Fan Runs Continuously We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We explain what switches or controls may be set improperly or what else, such as a shorted wire, can cause continuous HVAC fan operation. These same diagnostics also aid in air conditioning blower assembly diagnosis when an A/C blower continues running.
This article describes what to check if the furnace or forced air blower fan does not stop when you expect it to do so. We have no relationship with advertisers, products, or services discussed at this website.įorced air heating or cooling air handler troubleshooting: blower fan won't shut off: InspectAPedia tolerates no conflicts of interest.
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