Question about Ruud UAMB Air Conditioner

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We have a Roof Mounted RUDD Unit. Yesteday when I went to check the thermostat to see why the house was so cold I heard it making a humming sound. I turned the thermostate to 60 degrees then it stopped making a noise ahen back up to 66 degrees and it started making the same noise again. The heat did not kick in at all. I have the fan set to auto also.

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Good cks skeeter advised , if these ck out possible fan motor or capacitor

Posted on Dec 29, 2008

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You need to check if you have full 220 voltage to unit sounds like one leg of your power is out. You have slow blow fuses on this so turn off the breaker that goes to unit and then pull fuses out and check each one. You can check at the place where the main power comes into unit if you don't mind checking electricity but take your volt ohm meter and check the two power leads on the contactor that is the first thing that the power is connected to. Let me know if that checks out Okay. ken

Posted on Dec 28, 2008

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1 Answer

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The bearings are bad in the motor and after the fan runs enough it eventually gets hot, making the bearing screech and the fan locks up. Need to replace motor again. See if it has a warranty. The reason it gets hot is because the fan is what removes the heat from the coil and if the fan isn't running there is nothing to cool it off so to speak.

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Welcome to the world of Ruud! Ok James heres the deal. It sounds like the condenser fan motor has failed. Its not a repairable item but the motor is not too expensive. Disconnect the main power at the fuse block on the side of your house next to your a/c. Remove the screws that hold the top fan section and carefully turn the fan/panel assembly over taking care not to stress the wires. Determine how the fan is mounted (probably 4 screws) and go find your new motor. Both Rheem and Ruud use the same motor mounting. Most a/c supply houses have a motor that will fit or go to graingers. Make sure you get a matching run capacitor for that motor. It will have separate wires and not share any wiring with the old capacitor. The old capacitor will have to stay in place since it is also connected to the compressor. The old motor will have 3 wires and the new one 4 (2 brown for the capacitor and 2 others to put on the contactor that the compressor wires go to). If its a heat pump it could be a board and youll need help. good luck

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hi,
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Open up the air handler and check the blower... you will find the problem right there...

heatman101

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Rudd Achiever series model RQNJ-AO42JK 000 mfg


Turn the thermostat as low as it will go and have someone stand out side, they should here the condensor fan and compressor come on at the same time. They are two distinctive sounds so you should
be able to tell if the compressor is running.

If nothing happens and you are skilled with electrical
you can turn power off and remove the electrical
cover to the outside unit. Restore power and carefully
push in the contactor, if the fan and compressor
starts you have a thermostat or low voltage problem.

If just the outdoor fan runs on any attempt, more than likely you need a new capacitor.

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Sounds like the Unit might be low on charge.But without correct readings not sure.
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Get someone u trust to check it out and ask for their Rudd Dealership Training Credentials.

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CALL THE MANUFACTOR OF THE EQUIPMENT AND THEY CAN SHIP IT TO YOUR HOUSE.

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