Question about Ruud 13AJM42A01 13 SEER R-410A 3.5 Ton Air Conditioning Unit

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My compressor is making a humming sound

I put a booster on it an still want start up

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Either the contactor bad or compressor froze up.

Posted on Aug 17, 2015

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EWhat could be causing a Frigidair freezer to make a loud sound


have a technician check it out but a frequency hum indicates a faulty start/run capacitor for the compressor
if you continue to let it hum ,it may damage the compressor

Sep 23, 2015 | Freezers

1 Answer

My air conditioner will not start up. It makes a humming sound but does not kick in. I have a Kenmore window type air conditioner . It is model 253.70151. It was bought in 2012.


Sounds that compressor is locked,first check capacitor, if ok then you need a hard start kit for compressor,if still won't come on bad compressor

May 06, 2015 | Kenmore Heating & Cooling

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My compressor comes on for a few second, makes a slight humming sound, then goes silent; any suggestions?


Please realize I'm not a professional compressor repairman.

Your description "comes on for a few second, makes a slight humming sound, then goes silent" leaves me guessing. When you say "comes on" does that mean it "makes the pumping sound of a compressor" or it "Clicks"? Allow my musings.

On a plugged in and turned on compressor the compressor's pressure switch turns on the pump motor when the pressure falls below it's set low pressure threshold (usually ~ 90 psi). The pumps pushes air into the pressure tank until the pressure reaches its high pressure threshold (usually ~ 120 psi). If the compressor is not plugged in or turned on you can hear a click when the pressure switch turns on.

Aside: Leaks, of any sort, make the pumping more frequent or longer. Bad leaks can make it pump continuous because the high pressure threshold is never reached. The leaks can be in the switch, at line connections or in the pump (valves or piston rings) itself.

I once had a low-volume ultra-quiet compressor that made little more noise than a hum when compressing. If yours is not an ultra-quiet (clicks on, hums, and quits) than I'd have to guess that the pump might be binding instead of pumping. If it is binding then the motor would over-heats and shuts off.

Some compressors are oil cooled. If an oil cooled compressor was extremely low on oil would it bind? I suspect so.

If you suspect binding I'd find a parts list for your model to work from and disassemble the pump to investigate. (see link below)

That's my best guess on limited information. Good luck.

Campbell Hausfeld Air Compressor Parts

Jan 16, 2015 | Campbell Hausfeld Extreme Contractor...

1 Answer

My GDM-12 is not cooling. when I turn the temp up it make a loud humming sound.


If the humming last 3-5 seconds then makes a faint click sound and stops humming for a minute or two. Then resumes the hum again it may be your compressor locked down. Stuck. Most likely it is just a bad start capacitor not kick starting the compressor. A $6 part.

Mar 07, 2014 | True GDM-12 Refrigerator Commercial

2 Answers

New copeland compressor wont start


Hello,By all means install a hard start kit on the cap.Your wiring is correct.A scroll compressor usally doesn't need a start kit but I have seen 5 ton units that take one.Check the compressor tag and make sure the compressor is not a 3 phase motor!

Apr 21, 2010 | Heating & Cooling

1 Answer

Periodically cycles through a loud humming noise.


Hi, these are the early signs of compressor failure. i would put in a service call before it completely fails.

Mar 09, 2009 | Refrigerators

2 Answers

Kenmore not freezing nor cooling. humming noise


DONT SAY THAT COMPRESSORS BAD YET !!!! TECHCUMSE AND COPELAND ALL HAVE THE SAME COMPONENTS FOR STARTING THE COMPRESSOR. ALL COMPRESSORS HAVE EITHER A "PIN-TYPE PLUG-IN START RELAY, OR CAPACITOR START ASSIST RELAY" TO GET THE COMPESSOR TURNING.( FROST-FREE REFRIGERATORS ALMOST ALWAYS HAVE A START-CAPACITOR, RELAY, AND T-STAT COMBO ON ALL MAKES. THE IN LINE BI-METAL TYPE T-STAT THAT PREVENTS THE COMPRESSOR FRON OVER HEATING... THEY CAN GO WEAK. THIS IS THE "CLICKING SOUND YOU ARE HEARING !!! CALL A REPUTABLE DEALER THAT IS "FACTORY CERTIFIED" FOR YOUR MAKE AND MODEL AND GET A "FLAT-RATE" DIAGNOSTIC CHECK PERFORMED. NEVER LET A REPAIRMAN TAKE DEFECTIVE PARTS OUT OF YOUR HOUSE FOR ANY REASON. BY LAW THEY HAVE TO LET YOU KEEP THEM UNLESS THEY ARE REPLACING THEM COVERED UNDER WARRANTY FOR EXCHANGE. UNFORTUNATELY HUNDREDS OF CONSUMERS ARE "BILKED" BY THE " DOI-IT-ALL REPAIR-MAN. MOST MANUFACTURES ONLY HAVE 1 YEAR ON COMPRESSORS FOR REFRIGERATORS 5-10 YEARS ON A/C COMP. DONT BE AFFRAID TO WATCH AND ASK QUESTIONS TO REPAIRMEN YOU LET "INTO YOUR HOME".

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