Question about Ruud UAMB042 Air Conditioner

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Daily reset of outside unit

About once a day (anywhere from 3-5pm), the fan on the outside unit (Ruud UAMB-042JAZ) will not turn, but warm air is blowing from the vents. Pushing the reset button on the outside unit immediately starts the fan turning and the cool air to blow. Suspect overheating as it is over 100F daily. Any ideas would be helpful.

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I have the same unit and was having the same problem. My brother works on A/C's and told me that the coils most likely needed cleaning from the inside out because when they are clogged with a lot of debris the system will overheat and cause that switch to trip and so far it has worked. What you need to do is turn the main breaker off to the outside unit first then take the four screws out of the top of the unit, use a flat head screwdriver and lift the fan it's self up out of the carefully taking caution of the wires going to the fan, then take the garden hose with a spray nozzle and wash the coils from the inside spraying through the coil to the outside and then wash the louvers off of all the debris and this should help.

Posted on Aug 03, 2008

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Exterior fan motor replacement


i would replace its run capacitor first.

Jul 04, 2013 | Ruud UAMB Air Conditioner

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The compressor and fan do not work properly. When i hit the reset the power for the compressor comes on but the fan barely turns and the compressor over heats until the breaker pops back out.


The outside fan is giving up the ghost.. needs to be replaced. sorry for the bad news .You could try to replace the capisitor and check the contactor to the fan .. But my money from what you tell me is on the fan motor

Aug 04, 2011 | Ruud UAMB Air Conditioner

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Ruud upne-042jaz fan not starting


If the fan motor is not starting it may be the capacitor located behind the electrical panel on the outside unit. These are relatively inexpensive and easy to change. You can disconnect the power to the outdoor unit and remove the capacitor. Take it to your local HVAC wholsaler or contractor and have them check it. If its bad it should run you 20 to 30 dollars to replace. If it is not the capacitor then it may be the fan motor. If the blade turns easy it means the bearings are fine. One of the windings may be open thus making it able to turn but not run when power is supplied. I think this is a heat pump and there may be a control board on the outdoor unit which may control the operation of the fan. I have not found a wiring schematic for the unit yet. Once I find one I will let you know. The problem listed above is very comon and inexpensive for you to fix. If it is something other than the capacitor, I would call you local NATE certified technician and get her looked at.

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We have a RUUD AC unit, model number UAMB-042JAZ. ...


Those are the low voltage wires from the thermostat and transformer. Yes he can just match up the colors and splice with wire nuts or something else to hold the tight. If the transformer got shorted out during any of this it may need to be replaced. Hook them up and if the unit runs, then no problem with the transformer.

May 21, 2010 | Heating & Cooling

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My Ruud Air Conditioner Model UAMB-048JAZ is not blowing cool air. The fan blows, but it doesn't blow cool air. It worked this morning, and now it doesn't. I found a red reset button and pushed it, but...


3 things it could be:

#1 problem with AC units - dirty coils, this leads to many other problems and is caused by neglecting to change filters monthly. You can buy coil cleaner commercially, but it is not the coils you see that get dirty. There is another set inside that is usually not visible. If you look outside and your unit is "iced up" there is a 98% chance that is your problem. Sometimes it could be iced and you can't see it from the outside. Solution, turn AC off and blow fan to thaw. When thawed, clean coils with coil cleaner and coil comb.

Relay switches, you already pushed it so you may have a bad switch.

These are the two most common problems. A mechanic will be quickl to say it is your compressor for $. There are normally only half a dozen things that go wrong if your AC is 10yrs or less. If it is over that, it could possibly have a more serious problem. (Secret hint - I have known AC's to last 30+ years if the filters are changed regularly. Letting dust and dirt build up on coils invites a host of other problems due to the stress it puts on the other components.

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that pops when the internal pressure gets too high,try cleaning coils off with hose,could have a fan motor not running up to speed.

Jun 25, 2009 | Ruud UAMB Air Conditioner

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Does the air handler take a minute or two to start, this would be normal so that it doesn't blow cool air into the house before the unit is warmed up. If not could be the fan relay is weak and needs replacing. As far as the outside unit it sounds like you need to check the refrigerant. In cooling they are 70/150 psi. This should be checked in cooling mode, once you turn it to heating mode the pressures switch bring heat inside the house instead of out. I hope this helps.

Oct 23, 2008 | Ruud Heating & Cooling

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Check to see if there's low voltage reaching the contactor's coil. If there is. and it doesn't close (pull in), then it's defective and should be replaced. Cut the power and check ohms to be certain.

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Air Conditioners have a fan speed relay built in the unit, faster for cold air and slower for warm heated air. It is very possible that your relay is defective

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