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Old 07-01-2014, 02:41 AM   #1
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slow fan motor


Some friends of mine called me this evening, they had a brownout earlier and their unit stopped cooling, This is a Goodman GPH rtu that I installed back in 08.

I just got back from taking a look at it and discovered that the condenser fan motor seems to only be running at half speed. This unit uses the same capacitor for the fan and compressor but the compressor is starting and running just fine, the capacitor didnt have any visible damage either.

Is it possible that the capacitor is bad? Could the motor only be running on one leg? didnt think to check for 220 to motor until I was on my way home, it's late and I'm tired.
Thanks.

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Old 07-01-2014, 09:11 AM   #2
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Anyone? I need to go fix this thing this morning. Thanks

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Old 07-01-2014, 09:37 AM   #3
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Scratch the one leg 220 volt question, I just realized the motor wouldnt run at all. Last time I try to think in the middle of the night!

I'm going to go ahead and replace the fan motor and capacitor. Can the dual run cap be left in place for the compressor, or should I change that out for a single also?
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Old 07-01-2014, 09:41 AM   #4
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Check the capacitor first. See if it is putting out enough mfd or even has continuity. I would take one with me.

Discharge it B4 sticking your ohmeter on. If it is good then the battery in the ohmeter will slowly charge it and it will show continuity. Still need to check the mfds as it may be weak.
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Old 07-01-2014, 10:34 AM   #5
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Quote:
Originally Posted by yuri View Post
Check the capacitor first. See if it is putting out enough mfd or even has continuity. I would take one with me.

Discharge it B4 sticking your ohmeter on. If it is good then the battery in the ohmeter will slowly charge it and it will show continuity. Still need to check the mfds as it may be weak.
The numbers on this capacitor are all mumbo jumbo. What capacitor would I need for the compressor?
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Old 07-01-2014, 11:24 AM   #6
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There should be numbers like 370 or 440 Vac and then 35/5 which is the mfds or you have to call Goodman parts with the unit model #. mfd = microfarads
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Old 07-01-2014, 02:56 PM   #7
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Quote:
Originally Posted by yuri View Post
There should be numbers like 370 or 440 Vac and then 35/5 which is the mfds or you have to call Goodman parts with the unit model #. mfd = microfarads
Got it fixed. The dual run cap was a 60/5 370v, I replaced it with a single 60 370v and put a new seperate cap for the new fan motor.

I felt stupid asking, I prefer more to stick with the installation end of this game, more than troubleshooting.
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Old 07-01-2014, 03:23 PM   #8
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No Problema. Better to ask than be a parts changer.
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Old 07-01-2014, 11:23 PM   #9
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We hit 112 here today, these people were happy to have their air back. Guess it's time I start studying capacitors.
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Old 07-01-2014, 11:29 PM   #10
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Going down to 48F tonight. Heat on at night and AC in the next day. Go figure.

Google: how to test capacitors. UTUbe vids galore.

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