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Furnace blower compartment inspection and repair © Daniel FriedmanAir Handler Blower Fan Won't Stop in Cooling Mode - FAQs

Indoor AHU or Furnace Blower Fan that Will Not Stop in Cooling Mode

FAQs about what to do when the furnace blower or air conditioning blower fan won't stop running when it's in cooling mode.

This article series 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. We explain what switches or controls may be set improperly or what else, such as a shorted wire, can cause continuous HVAC fan operation.

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Why the air conditioner, air handler or furnace fan won't stop

Fan ON AUTO switch settings explainedQuestions & answers about why an air handler, A/C blower or furnace blower fan does not stop when you think it should are discussed here.

These questions and answers were posted originally

at FURNACE or A/C BLOWER FAN WONT STOP - be sure that you check that article for help in diagnosing a furnace fan or blower that doesn't stop running.

Article Contents

Also see the diagnosis and repair help for air handler fans that won't stop, given at

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Air Handler Blower Won't Stop - Cooling Mode, FAQs

AC is cooling but blower fan won't stop when it should

my ac is cooling fine but the blower fan wont cut off when its time any suggestions - On 2011-06-26 by gene -

Reply by (mod)

See our repair diagnostic steps at these articles

Heating furnace won't turn off - temperatures way above thermostat setting

At first heat would not stop going up now heat is same but way higher then the setting why won't stop running - On 2018-11-15 by Andrew Anderson

Heating furnace won't turn off - thermostat is turned off

I have my blower motor runs with the thermostat turn off, I change the capacitor and the limit switch it didn't help,the problem occurred when I had a new ac unit out in - - On 2018-10-15 by tony

Reply by (mod) -

Andrew and Tony:

Let's start by checking out the diagnostic procedures at the article for furnace won't stop

There you will find a more complete list of likely causes then what I could make up in a brief off-the-cuff reply. Let me know how that works for you. See this page

FURNACE or A/C BLOWER FAN WONT STOP

 

A/C shuts off but blower fan continues to run

After my home reaches the temp. I set my thermostat to, the AC will shut off but the fan blower will continue to blow.

If I bump the temp on the thermostat up another degree, the blower will kick off.

How can I make the blower kick off when the temp the thermostat is set to is reached? On 2018-08-12 by Bo

by (mod) - the thermostat is not precisely accurate

Sure the thermostat is not precisely accurate - it's not lab-grade precise.

But if just touching the dial by pushing the temp up - that means setting the temp another degree above the room temp - turns off the blower, then yes, then that sounds like a loose connection or wire or a failing control.

 

In Cooling Mode & Fan on Auto every morning the fan comes on for a long time - why?

Hello! My Honeywell digital thermostat is set on cooling currently and the fan is set on auto. Everything seems to be working fine, except every morning the blower fan comes on for a long time (an hour or more) even though the thermostat shows no activity (cooling ihas not come on)

The inside temp is already at set point and drops to a couple degrees below the set point within a few minutes of the fan coming on and stays there the whole time the fan is running. This does not seem to happen at other times of day. The thermostat seems to be working the way it should. - On 2020-07-15 by Pam -

Reply by (mod): examples of normal long "ON" cycles in cooling mode

I'm guessing that your thermostat is using a night time setback that drops the call for cooling - an energy savings measure - OR it's simply that where you live the outdoor temperatures drop enough at night that your A/C system can stop running for a time.

Then in the morning when either your thermostat calls for cooling the home to a lower temperature OR when your house starts to heat up from first sun exposure the system turns on and has a longer run cycle to get the house temperature down to the cool setting.

That is, if the system is able to cool your home adequately through the hottest parts of the day it's probably operating normally.

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