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Brian HVAC Guy
Brian HVAC Guy, HVAC Technician
Category: HVAC
Satisfied Customers: 771
Experience:  I have been an HVAC/R mechanic/technician for 30+ years.
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I have an American Standard Freedom 80 w/AC. When I run the

Customer Question

I have an American Standard Freedom 80 w/AC. When I run the AC, or just the fan, it runs for around 2 minutes and then shuts off. The outside AC Condenser keeps running but the fan shuts off. I'm thinking that there is some type of heat sensor or overload inside the motor. Any ideas?
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: Air filter is nearly new. I even removed the filter. The thermostat setting is right. The fan shuts off even if I'm only using the fan and not the AC
JA: Do you plan on doing the work yourself?
Customer: Probably/possibly. Depending on how invasive it is.
JA: Anything else we should know to help you best?
Customer: It's around 8 years old and never had a problem until now
Submitted: 1 month ago.
Category: HVAC
Expert:  Brian HVAC Guy replied 1 month ago.

Hi I'm Brian and I'm here to help! This could be due to one of a few things. Please allow me a few moments to type them up and I'll be back shortly.



Expert:  Brian HVAC Guy replied 1 month ago.

The first thing I would try is to turn on the heat and set the thermostat high enough to run and see if the problem presents itself in the heating cycle as well, this will narrow the problem down. If it runs ok in heat then chances are good you have a problem with the furnace control board's fan relay contacts which activate in cooling and fan only. The only option here is to replace the board.

If the problem presents itself in the heating cycle then the problem is more likely with the fan motor or capacitor. If the blower motor run capacitor is weak, it will behave like this and needs to be replaced. These are very cheap so it's worth it to summarily replace it to see if that helps. I should caution you, capacitors (especially blown ones) can hold a nasty charge even after the power is shut off to them. So with power shut off, you should take a screwdriver, and only holding the handle, short each capacitor terminal to the unit casing with the shaft of the screwdriver before touching them. This will ensure the capacitor is discharged and won't bite you!

Tight bearings in the blower motor or a problem with the blower wheel can cause this problem too. You should check to see that the blower wheel turns freely without rubbing and the motor turns and coasts easily. If not, chances are the motor bearings are worn or the blower wheel is rubbing on the housing. You should hear the blower wheel if it's rubbing.

Let me know if you have further questions on this subject, use reply if so. Otherwise, please remember to rate before leaving (3 stars or higher please!). Bonuses are always appreciated! And remember, follow up questions about this topic are free even after rating. Just post a new reply on this same question and I'll be notified. Thanks for allowing me to help and thanks for using Just Answer!

Thank you,

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