Question about Ruud Matching Split Air Conditioner

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My unit is running but not cooling

A couple days back I noticed the inside temp to be 90 degrees so I looked indoors and out, I noticed my outside fan not running. so I hit the circuit breakers and tries turning unit off then on and the fan would only turn on for moments, the unit is running but no cold air. I cannot reach the main unit-it is in the garage ceiling, this has never happened before. I only rent the place but if it is a easy fix Ill do it myself. Any suggestions?

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  • chmoon Mar 31, 2008

    My compressor fan will not run.  I replaced the contact relay with a new one.  When you turn on the power, you can here the relay clicking but the fan nothing happens.  You can push and hold the reset button down and everything runs. What could this be?

  • Larry Gene Jul 17, 2008

    Compressor is running but the fan is not. After turning it off at the Tstat and let it cool down for an hour, compressor and fan will come on, and everything is fine for a day or 3. I cleaned condenser coils, checked for obvious loose wiring, discharged the start capacitor, disassembled the start relay, burnished slightly the relay contacts; worked fine for 2 days. Then started same thing over? Let it cool a while and does fine.

  • likemyac Aug 01, 2008

    Same problem, fan/unit goes off after 10 minutes or so. Replaced run capacitor still same problem. When it is running cools very well, large copper pipe gets really cold and small copper pipe gets really hot. Exhaust from fan is warm.
    Fan does seem to have a little bit of dirty oil trail around the shaft.

    Any help would be greatly appreciated.



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Hi, Probably not an easy fix. Sounds like its shutting down on Low pressure or High pressure. Could be condenser fan motor. The easiest thing it could be would be a run capacitor on the fan motor. They usually swell up and or leak oil when they go bad. You could check on that but make sure all the power to the unit is shut off before working on it. I would just call the manager or owner myself if I were you. I'm sure he is charging enough rent for him to cover such problems. Hope I have helped. kstfas

Posted on Sep 10, 2007


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Check the air filter and if it is dirty, replace..
Turn equipment off and let the ice melt.
After ice melts, place a/c in cooling mode and set the thermostat to 3 degrees below room temp display.

The indoor unit fan should start blowing cold air immediately and then turn off once the room temp drops one degree below the cooling temp setting.
If the indoor unit does cycle off, check the outdoor unit and make sure it turns off at the same time.
If the outdoor unit continues to run and the indoor fan is not running, the indoor unit will ice up.
A defective compressor relay that is stuck in a closed position will cause icing of the indoor unit because it keeps the compressor running when it should turn off with the indoor fan.

Do you have an error code being displayed on the controller?
Is there an led light that is flashing on the indoor unit?

Another possibility causing the indoor unit to ice up is if the freon in the system starts to get low.
Make sure the ice has all melted for this next check.
Pretty easy to check without special tools.
If the air filter is clean and there is no dust/ dirt blocking the fins on the indoor unit, turn a/c back on to cool and check that the indoor unit fan comes on and is blowing air good.
Once everything seems to running good go to the outdoor unit.
There will be two lines with black rubber insulation covering them.
Peel back the insulation three inches on each line and observe the copper lines.
If either line starts to frost up the a/c system is most likely low on refrigerant.

Another cause of indoor unit icing could be that the aluminum fins behind the air filter are clogged with dust or other foreign material.
This would block the air that must be pulled in causing the indoor unit coil to become too cold due to lack of air flow and it will ice up.

Operating the cooling system when the outdoor temperature is below 60 degrees can cause the indoor unit to ice up also.

I'm Robert.
Florida certified a/c contractor. 30 years experience.
Hope this helps.

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Check the following:

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You should have a 15 to 20 degree temp drop across the evap coil. (return air vs supply air)

Can you verify that the compressor is running?
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it really sounds like it is still undercharged.
Check the temp drop, let me know what it is.
Also tell me what the outdoor ambient temp is.

( for example.... 98 degree outdoors with 85 degree indoor temp could result in pressures something like 325 on the high side and 75 or 80 on the low side.
With the exact same unit, but 80 degree outdoor temp combined with 70 degree indoor temp, your pressures could read 215 low side and 55 low side. Not to mention that more efficient units often have higher pressures on the low side because they have more coil space and remove heat more efficiently)

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