Carrier AC outside fan motor not working


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Old 08-01-14, 12:14 PM
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Carrier AC outside fan motor not working

This is the first time I am attempting to fix my outside AC.
Symptons: For some time I had to give the fan a push and then it would kick on. Now it is just humming.

What I did: tried another capacitor, did not work.

What to do next: I have attached two pictures of the fan motor label, because I do not know what kind of generic motor should I buy. I plan to spend up to 70 dollars for a new one, preferably not more than that.

Here are the specs for the capacitor I have, don't know if the previous service done a few years ago placed the right one in relation to the fan motor specs.

45+5MFD=5%
440/370VAC 60/50HZ
Rated to 85C max Temp

The label on the fan says: CAP 5.00/370V HZ 60

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Old 08-01-14, 01:45 PM
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You have a dual capacitor, the 45 mfd side is for the compressor and the 5 mfd side is for the fan motor. Did you try replacing the 5 mfd side with a known good 5 mfd capacitor? The symptoms you described (fan starts with a "push") are typical of a bad capacitor.

Does the fan motor turn easily? Do you have a multimeter? If so, have you checked the resistance of the motor leads (power off, wires disconnected)?
 
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Old 08-01-14, 06:21 PM
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Thanks for educating me. No, I have not tried replacing just the 5mfd side, I just replaced the whole capacitor and it didn't do the trick (Should I still replace the 5 side?) This is what led me to question the fan motor. Unfortunately I don't have a multimeter, wondering if there is an affordable make and model to use for testing how appliances work in the house. I am shopping for one, no need for a top of the line. Trying to find the cause by elimination...
 
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Old 08-02-14, 05:37 AM
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The reason I asked if you had replaced the 5 mfd side was because I didn't know if you replaced the capacitor with a dual cap, or if you had just replaced the 45 mfd side. There's always the possibility that the replacement capacitor you bought is defective. The only way to know would be to either get the new cap tested, or buy another cap and see if it works any better.

If you want to purchase an inexpensive DMM (Digital MultiMeter), Harbor Freight has one for under $10. I have a couple that I have gotten as freebies and the work fine for general purpose testing.
 
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Old 08-06-14, 03:17 PM
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Thanks for your input Bob14525. I finally bought a DMM, a Newcason XC6013L and it arrived just now. The new capacitor I bought is working fine, but the old one was diagnosed 40 out of 45 and no response out of 5. It's a packard capacitor, and it's no longer good, I suppose since this is the first time I am using a DMM. Can this DMM also test the motor fan? Sorry for the question but I was just wondering. I have not installed back the new capacitor, but I will be on the lookout for a possible fan motor failure as well.

Update: I installed the new cap, and there is just a humming. This means the fan motor is dead and if I am right, what generic make and model should I get, based on the pictures below? This model is discontinued. I am hoping to spend no more than U$ 70.
 

Last edited by Nhaps; 08-06-14 at 03:40 PM.
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Old 08-06-14, 03:38 PM
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No, that meter will not read OMH's. I wouldn't exactly call that a mutimeter. Take those pic's to Grainger's and they will get you the right motor.
 

Last edited by skaggsje; 08-06-14 at 03:49 PM. Reason: Correction
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Old 08-07-14, 03:33 PM
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Ok thanks for the info. I bought this replacement motor: Fasco D7909 5.6-Inch Condenser Fan Motor, 1/4 HP, 208-230 Volts, 1075 RPM, 1 Speed, 1.8 Amps, Totally Enclosed, Reversible Rotation, Ball Bearing for around 65.00. Will install this Sunday and let you know.
 
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Old 08-07-14, 04:44 PM
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That Fasco motor is half the price of the comparable GE replacement. I hope it holds up for you.
Did you remember a new 5mfd capacitor too ?
 
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Old 08-07-14, 05:44 PM
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Yes, got a new 45+5 440/370.
 
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Old 08-07-14, 05:50 PM
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Many after market motors have their own capacitor leads requiring their own stand-alone capacitor. That would be a 4 wire hookup. You'll need to check the wiring instructions for 3 or 4 wire hookup.
 
 

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