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Waka-048jaz Compressor hums then starts. contactor chatters

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SOURCE: replace contactor

On single phase your incoming power lines go to L-1 & L-2, the lines to the compressor go to T-1 & T-2. With A/C current it does not matter which one goes to which side as long as the line goes to the L side and the compressor power lines go to the T side. As long as the coil voltage is correct any contactor will replace the original.

Posted on May 29, 2008

  • 230 Answers

SOURCE: warranty on compressor

The actual age of your unit can be determined by the serial number. Based on the age indicated there they can tell you if the warranty is still valid. Your local Rheem/weather king dealer can do this for you. Most compressor warranties are either 5 or 10 years. Good Luck!

Posted on Jul 03, 2008

  • 17 Answers

SOURCE: compressor will not start.

sounds like the compressor is shorted out, or froze up. the 1 second buzz you hear is the compressors internal overload protector kickin in and shutting the comp. down. its a self resetting circuit breaker. for the most part, the compressor is out and needs replaced.

Posted on Sep 02, 2009

  • 413 Answers

SOURCE: the compressor is not starting.

Check the capacitor. (The thing that looks like a big battery). If it is bulged out on the sides it is shorted. The compressor could be "locked" up which is the worse case.

Posted on Apr 11, 2011

Testimonial: "Capacitor was my next guess. I measured ohms per google and they were correct. I will get a capacitor tomorrow. If no, call AC guys"

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Uamb-048jaz ruud a/c stopped working what should i check

is outside fan running tells you if contactor is made if so change capacitors on compressor. if not running check transformer,& thermostat.

Sep 01, 2013 | Ruud Heating & Cooling

1 Answer

I have a Ruud AC Model UAMBO48JAZ That has started to have a hum when it is running it is cooling and has been checked for freon. Could it be the capacitor?

More than likely, it is the hum of the coil in the contactor. Generally, residential uses 24 volts to energize the coil built into the contactor which pulls in a set of contacts (hence the name contactor) to send 220 volts to power the compressor & condenser fan motor. Contactors are relatively inexpensive... so if the noise bothers you, replace it or have it replaced. Put your mind @ ease, the humming noise will do no damage.

Jul 27, 2012 | Ruud UAMB Air Conditioner

1 Answer

Tech 2000 just quit. The problem is the outside unit. I cannot get it to start when I manually push the contactor. No fan and no compressor. Unit just hums for a couple of seconds and then no hum. ...

Sounds like a shorted capacitor. THe capacitor is located right beside the contactor. Looks sort of like a batter. Probably has 3 posts on top. If its shorted it usually will look pregnant or swollen. A capacitor is not very expensive. You can get one at any air cond supply house.

Jul 13, 2011 | Carrier 38CKC042 Air Conditioner

1 Answer


I assume that is a 240 volt unit. If you have a volt meter, check for power across the contactor . If it is a 240 volt unit you should get 240volts on both sides of the contactor. If you DO have voltage across the contactor (after it closes) you need to try and get to the compressor where the wires connect to it. There should also be 240 volts at the compressor terminals marked "C" and "R". If you have power at the compressor between C and R and the compressor is still not even trying to start, the compressor windings are open. Here is really what any tech will need to know to really help you:
(1) Is the fan motor running?
(2) what voltage is the unit?
(3) is the compressor humming or trying to start?
(4) do you have the proper voltage at the unit?

If you can answer these questions and you want to email me, do so and I will step you thru it. Be very careful , as you are dealing with high voltage.

Apr 14, 2011 | Goodman HDC24WMC24 Air Conditioner

2 Answers

Getting a hum from the condenser

thats it? you may be hearing the contactor relay which is fed power from inside (24v). could be a bad fuse which was caused by a bad or going bad compressor. possibly one of the terminals on the compressor (probably start) has burned off and grounded on the compressor which blew the fuses. Get an electric meter and test the fuses and if they are good, inspect the compressor and see what the wires look like. If they are good disconnect them and write down where they go. test the ohms between each terminal and list them on this site ill tell ya if you have a good or bad compressor. also test ohms from the ground to each terminal and if you get 0 on any terminal to ground your compressor is dead for sure...

Oct 10, 2009 | Heating & Cooling

1 Answer

Nordyne air cond Model E2eb-017HB got wet, shorted out

sounds like you experienced an ice over. this can destroy the compressor. if contactor is humming the call for cooling is present but the breaker poping is cause for concern. possibly needs new compressor.

Aug 23, 2009 | Heating & Cooling

1 Answer

Have a janitrol cple24. Replaced both outdoor fuses and contactor and still have buzzing. What else could be the problem?

does the unit work properly and still buzz? loose mounting screws on a contactor will create a buzzing noise
is the compressor humming -try a hard start capacitor/boost capacitor
is there 220v at the contactor

Jul 30, 2009 | Goodman CPLE24-1 Air Conditioner

1 Answer

A/c compressor hums

The compressor may be fine after setting off or a day. After retyring it then if it still dosnt start either replace the run capacitor to the compressor and fan motor or have it checked to see if it is in range.

The hum your hearing could that be the contactor relay humming?

May 15, 2009 | Goodman CKL60AR60 Air Conditioner

1 Answer

Replace contactor

On single phase your incoming power lines go to L-1 & L-2, the lines to the compressor go to T-1 & T-2. With A/C current it does not matter which one goes to which side as long as the line goes to the L side and the compressor power lines go to the T side. As long as the coil voltage is correct any contactor will replace the original.

May 29, 2008 | Ruud Central System Air Conditioner

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