Condenser Fan Spins in Wrong Direction


Old 06-08-14, 02:33 PM
Thread Starter
Join Date: May 2014
Location: USA
Posts: 14
Received 0 Votes on 0 Posts
Condenser Fan Spins in Wrong Direction

I posted a few questions recently about the compressor of my Trane XE 1000 3.5 ton unit, which is just dead. I came to the conclusion I would need to replace the condenser (unless I can find a suitable compressor to swap out).

Since then, I've left the thermostat in the "Off" position with the temperature turned all the way up. Today I noticed the fan on the condenser was spinning. I went over and pulled the disconnect out and it stopped (so it wasn't just from ambient wind). I reconnected the disconnect, then went back inside and turned the thermostat to the "On" position, and lowered the temp until I heard the inside fan start. I went down and check the condenser and saw the fan was spinning, much faster and in the opposite direction! I checked to see if it was blowing cold air (miracles sometimes happen) but it was blowing 74 F. I went back to the thermostat, turned it "Off" and raised the temp all the way.

When I went back to the compressor, the fan was slowing down, then stopped, then started spinning in the opposite direction.

Can somebody tell me what's going on? Is the thermostat bad?
Sponsored Links
Old 06-08-14, 02:50 PM
Join Date: Feb 2014
Location: USA
Posts: 2,104
Received 0 Votes on 0 Posts
I don't think your stat is bad. I have have been doing this a long time, but I have never seen that happen. I'm sure someone has seen this and they will post something. I'm curios to see what they have to say. First think I would check is the capacitor and contactor.
Old 06-08-14, 05:07 PM
Bob14525's Avatar
Join Date: Jun 2013
Location: USA
Posts: 1,470
Received 11 Votes on 8 Posts
There was a recent post in this forum from someone who had a similar problem (condenser fan running backwards). He had recently changed the capacitor and upon checking the wiring, he found that the capacitor was wired incorrectly. After he corrected the wiring mistake, the fan spun in the correct direction.
Old 06-08-14, 05:53 PM
Join Date: Nov 2011
Location: USA
Posts: 699
Received 2 Votes on 2 Posts
I seen it a time or two. It's kinda funny. Bad capacitor. The owner did not even realize it. Still cooled but not as well. Switching the wires on the cap. would change direction but for how long? Better to replace.
Old 06-08-14, 06:02 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 52,736
Received 346 Votes on 324 Posts
A condensor fan could only spin with the contactor off if it was a single pole contactor. I've seen the windings in the fan short to ground and between that and one leg of the 240v still connected... the fan could spin.
Old 06-08-14, 06:08 PM
Join Date: Nov 2011
Location: USA
Posts: 699
Received 2 Votes on 2 Posts
Just commenting on the backward spin which still makes me smile.

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
Display Modes
Ask a Question
Question Title:
Your question will be posted in: