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1990 model RUUD AC unit. Fan runs, no cooling

1990 model RUUD AC unit. Fan runs, no cooling inside the house. Fiddled with thermostat...no difference. Can't feel very much air coming thru ducts.

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  • Robotinner May 11, 2010

    is the unit outside running? can you here 2 distinctive sounds of motors when you are near it?

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Is the outside unit running? Fan and compressor?

Posted on Jun 30, 2009

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Hello all My Rudd AC unit will start and run find maybe for 10 minutes and cool air then the fan outside will stop and unit hums or hisses and blows hot air inside vents. I changed out Thermostat and Run...


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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1 Answer

My American Standard Heritage 11 unit was not working properly when i came home from work and the temperture in the house according to the thermostat show the temperture in the house to be 85 degree&#


the dual run capacitor is bad located in main panel of unit size of small red bull can it will be swelled up on top indicating it bad get on at electric motor or electric supply house most ac stores wont sell it has a rating like 35/5 370

Aug 27, 2012 | Heating & Cooling

1 Answer

What type of run capacitor do I need for a Ruud AC model UPNJ-031JAZ (outside unit)


Looks like it should be a 35/3 370VAC. If it is not legible on the old capacitor read the data plate on the fan motor and compressor. These should say "uf" or "mfd" rating. Good Luck!!

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Apr 17, 2017 | Heating & Cooling

1 Answer

Earlier this week, I noticed that the house felt "stuffy" but the thermostat showed everything to be cooling as expected. Last night, the house was definitely warmer than expected when we got home. My...


If both fans runs (inside and outside), check if the compresor runs , if does probably the unit is low in freon and needs to be recharged after the freon leak has been fixed (remember this is a seal system and it shouldn't leak), but if the compressor doesn't work , it could be the capacitor , the pressure switch (if it's low on freon ) or the compreessor itself.But befor do anything ,if you have a digital thermostat replce the batteries.

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Cool air, but no fan, electrical smell inside house


most like it the motor windings are burn and you need to replace the blower motor

Sep 27, 2009 | Ruud UBHC Air Conditioner

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Have an electrician check the connections in your panel, this sounds like a loose/bad nuetral connection

Jul 26, 2009 | Ruud Heating & Cooling

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The outside unit on our Ruud heat pump won't turn on. The inside fan blows but the unit outside sits idle - no fan turning, nothing. It was cooling earlier today, but when I came home from shopping, the...


first look for red button neer the copper line set if has one push it second inspect thermostat wires for weed eater damage check disconnect for fuses check breaker at main panel pull disconect and remove cover check stat wire connections look at the capacitor if swelled up on top bad if all look ok put disconect in using insulated object manually push in contactor if unit comes on check for 24 volt ac on yellow stat wire to common if none stat wire could be loose at indoor unit or stat bad hope this helps you

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1 Answer

Ho to turn on central AC unit? (Ruud High Efficiency)



This is typical wiring for a 4 wire thermostat

R = Red One Side of 24 volt Transformer
G = Green Blower relay
Y = Yellow Cool Condensing unit
W = White Heat Furnace

Apr 28, 2009 | Ruud Heating & Cooling

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