Testing your compressor will alleviate a lot of uncertainty you may have in determining if your compressor is operation/functioning properly.

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35 thoughts on “How to Test For BAD Compressor. Ohms Test With MultiMeter

  1. John Tudd says:

    Thats definitely not accurate. My compressor read common to run is 1.1 Common to start is 2.4 and run to start is 1.8. Then nunbers no where near add up. And my compressor works fine.

  2. Frank Montez says:

    GEEZ , the guy helping me at AC place their place not open today or tomorrow AND I need to ask him again something . He said on blower motor if I disconect the cool terminal wire on circuit board and connect the bottom black wire to cool terminal that ( this is what I'm not sure what he said and needed to talk to him ) if it works ( or doesn't ) that means board is bad NOT the motor ?? OR is it the other way around ?? And yes replaced capacitor . Still the same barely running the blower not full speed and shuts down after a while with new capacitor

  3. Sebastian says:

    Good video. One thing I do when I’m working on my ac unit though is I shut off the main breaker before pulling out that disconnect for safe measure . I’ve seen some of those disconnects falling apart because they’re cheaply made. just an FYI.

  4. Russell Swansen says:

    I ran the tests as you outlined and the ohms added up as you said they should, no shorts either; however, the compressor will not run and makes an intermittent short buzzing sound as though it is trying to start, but does not start. The capacitor also tested good but I replaced it anyway. So I am confident the capacitor is good. Any thoughts on what is wrong?

  5. Kamah Dickson says:

    Thanks ,that’s a great job. I suggest a proper insulation resistance test should have been carried out with an insulation resistance tester (merger). More so you didn’t specify the expected normal resistance of the compressor to serve as an expected datum for comparison.
    Thank.

  6. TheWpruden says:

    I like the video excellent!!!
    However motors especially outdoor condenser fan motors when ohm out motor for short is good but STRESSING the windings with a megommeter is best.
    Great video again.

  7. John Smith says:

    Hello. My tests as you provided are all good. All leads open to ground. All leads passed continuity end to end. However the following is my ohm readings between leads . B to Y = 1.7, B to R = .9, (I could have these reversed), and Y to R = 2.4 ohms. The 1.7+.9= 2.6. Is this good enough to pass? The tenths were jumping around some but these were the most stable readings.

  8. lowkey says:

    Thanks for the video, still stumped though. I have a buzzing noise when the compressor tries to kick on, and it doesn't start. Capacitor is fine, contactor is fine, continuity of the wires is fine, resistance of the compressor is fine. I think that might mean it's something mechanical with the compressor itself?

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