Question about Ruud Matching Split Air Conditioner

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Not cooling fans running in and outside but not cooling very good

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What would cause a central air, coils to frost over and not get as cool as it should

Posted on Sep 20, 2008

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Can u give me more info? have you felt of the large copper valve at the condenser? have you checked your air filter? get me a temperature reading of the large copper line and the ambient air around the condenser, and out going air of the condenser. also what is the sq. ft. of your home, and the model # of the indoor and outdoor unit. thanks J

Posted on Jul 20, 2008

  • Jason Boyd Jul 20, 2008

    rule of thumb. appx 400-450 sq ft per ton



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2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?

With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.



Jun 28, 2017 | Bryant Heating & Cooling

1 Answer

Outside unit will only run for a short amount of time with A/C before the fan stops turning and starts humming, squealing/screeching and the top of the outside unit gets hot.

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.

Apr 19, 2016 | Heating & Cooling

1 Answer

Why does air conditioner trip circuit breaker?

call the technician
indicates a compressor problem
could be a failed start/run capacitor or compress failure

Nov 19, 2017 | Heating & Cooling

1 Answer

Fan outside isn't running and when turned on the unit outside is running very loud.

The fan outside keeps your compressor cool, the compressor, if left running without the fan running to cool it down can get damaged, the fan normally gets its power from a switch box located outside or near
it. or the motor on the fan could have just gone bad. the fan motor is not as expensive as the compressor to replace. its easy to replace. sometimes what goes out 1st on these motors is the capacitor,the capacitor stores enough voltage to give the motor that extra push to turn. many times its just the capacitor that goes out. when you purchase a motor make sure you also get the matching capacitor.if you can turn the fan and it starts running, its the capacitor, if it starts running and has any kind of bearing noise then you will have to replace the motor. good luck!

Aug 08, 2011 | Heating & Cooling

1 Answer

Should the outside fan be running when the heat pump is running. I am getting a frost build up outside on the coils.

outside fan ( condenser cooling fan ) need not run all the time . if it is frosting it can be seen from outside.

May 03, 2011 | Heating & Cooling

1 Answer

Sometimes, when the inside blower shuts down, the

I was leaning towards a bad contactor. Either sticking sometimes or not making good contact. I would inspect the contactor for pits or burn marks near the contacts. DO SO WITH POWER OFF of course...but, what's the reset button you are referring to?? I'm assuming this is a heat pump, please send model number!!

Jul 06, 2017 | Ruud UAKA060 Air Conditioner

1 Answer


In other words, A/C isn't cooling. Is the compressor running in the outside unit where the fan is? In either case, you will need a technician to look at it. It can also need asome refrigerant charge and leak detection. Good Luck, Ned

Oct 04, 2009 | Heating & Cooling

2 Answers

My fan isn't working

well there not enough data here to make a fairly good solution. but if all the fans are running! and no cool air then it is the compressor.

Jul 14, 2009 | Heating & Cooling

1 Answer

Cooling Fan

sounds like to me your motor in your fan is going. that is y your 4 runner ran nice and cool when its cooler outside. the hotter it is outside the harder your fan will work

Apr 25, 2009 | 1995 Toyota 4Runner

1 Answer

I have a carrier infinity system. On the thermostat it reads "sens error" where the outdoor temp is normally displayed. The inside unit is running but the outside unit is not. Any suggestions?

A burned or pitted contactor will/can cause a unit to not run. Outside fan. Just thinking out loud. Start with low voltage check at t.stat then check outside low volt. Set t.stat to on. If fan engages at least your transformer is good. Next set calling for cool. Drop t.stat 68-70. If nothing happens go outside and with a screwdriver depress the contactor in. If fan and compressor kicks in change the contactor. If contactor is pulled in check outside fan. Remove the wires from the compressor and see if the fan will run . If it does you have eliminated start components as good. The compressor has to be check. It needs to be ohmed out. Turn off power at disconnect. Pull the cover on the compressor. Check between pins; then pins to ground. Open or infinite is good.Have you checked fuses. Like small 3-5 amp fuses

Jul 03, 2008 | Carrier Heating & Cooling

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