A/C Fan not blowing, just humming

Reply

  #1  
Old 07-16-16, 05:29 AM
C
Member
Thread Starter
Join Date: Jul 2016
Location: United States
Posts: 3
Received 0 Votes on 0 Posts
A/C Fan not blowing, just humming

My inside A/C fan is not blowing, it just hums. The outside A/C fan seems to work just fine.

I replaced the inside A/C fan capacitor with brand new capacitor (same voltage and uf)... turned it back on, and it still just hums. I let it sit for about 1/2 hour to see if the fan would eventually kick on.... and it did kick on. It kicked on for only a few minutes, the air was cool, but didn't come out of registers very strongly...seemed to be blowing maybe 1/3rd to 1/2 as hard as it normally does. Then is just turned off and started humming again.

Haven't been able to get it started up since then.

Any ideas of where to trouble shoot from here would be greatly appreciated! Thank you in advance!
 
Sponsored Links
  #2  
Old 07-16-16, 06:04 AM
Bob14525's Avatar
Member
Join Date: Jun 2013
Location: USA
Posts: 1,586
Received 26 Votes on 21 Posts
Don't run the A/C if the inside blower isn't working, as the system will freeze up. That's likely what happened after you replaced the capacitor and you noticed that the airflow was reduced. It was likely reduced because the evaporator coil was frozen. Have you tried turning the blower motor by hand? Does it turn easily? If it turns hard, the bearings may be bad on either the motor or the squirrel cage (unless it's a direct drive motor, in which case there are no squirrel cage bearings/bushings). If the motor doesn't startup right away, it's not good to leave it turned on humming. That is just heating up the motor windings.
 
  #3  
Old 07-16-16, 08:43 AM
C
Member
Thread Starter
Join Date: Jul 2016
Location: United States
Posts: 3
Received 0 Votes on 0 Posts
yes, the motor turns easily. Have any other ideas for trouble shooting?
 
  #4  
Old 07-16-16, 08:48 AM
S
Member
Join Date: Feb 2014
Location: USA
Posts: 2,104
Received 0 Votes on 0 Posts
Try changing the fan speed. What is the make and model number?
 
  #5  
Old 07-16-16, 08:54 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 58,587
Received 1,044 Votes on 968 Posts
Welcome to the forums.

Sorry to say..... it's time for a new motor.
 
  #6  
Old 07-16-16, 09:56 AM
C
Member
Thread Starter
Join Date: Jul 2016
Location: United States
Posts: 3
Received 0 Votes on 0 Posts
The furnace is a Carrier 58PAV.

The motor was just replaced a few years ago, is it reasonable to need another motor so soon?
 
  #7  
Old 07-16-16, 10:24 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 58,587
Received 1,044 Votes on 968 Posts
If it was a generic replacement it could be.
 
Reply
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: