Question about Ruud UBHC Air Conditioner

1 Answer

My outside a/c unit fan stopped working. When I

My outside a/c unit fan stopped working. When I turn it on all I get is a humming sound? could someone tell me what it might be.

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 355 Answers

By saying the condenser fan is not working as well, I have to ask is the contactor making any kind of noise?. If the contactor is not making noise, look for some smaller wires going to the contactor. These are the low voltage wires that send 24 volts to the contactor. Make sure the thermostat is turned on, set it for a temperature lower than the current room temperature. Are you getting voltage to the contactor? If the answer is no check the W wire at the air handler and at the thermostat. The G wire runs the inside blower only. This is why you can put the fan in the ON position and not have the compressor running all the time. If you are getting voltage at the contactor turn the power back on at the compressor, take a sturdy insultaded rod, very dry wood or plastic remember electricity can kill damp wood can conduct electricity. Look for a small bump in the center of the contactor. Press it with the rod and see if the compressor turns on. If it turns on when you press this point on the contactor and off when you release it then the low voltage side of the the contractor is bad. If the bump is pulled in and the unit is not running take the multimeter and carefully check to see if your are getting 240 volts across the two bottom connections and then 240 volts across the top of the connections. If you are getting 240 volts on one side only the the contactor is bad and you need a new one. Turn off ALL POWER this is the breakers for both the compressor and the furnace. Again make sure the power is off. Make a diagram of the wire positions, then disconnect them. Remove the contactor and take it to an electrical supplier or an HVAC parts supplier and get a new one. Reinstall it and reconnect the wires. Turn the power back on and everything should be working again.
Good Luck

Posted on Jun 15, 2009

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

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

The fan outside is not working but it's not locked


What voltage is the unit it could be the capacitors for the fan motor is bad or a bad fan motor. my guess is the humming you are hearing is from the compressor. There should be two copper lines going to the unit feel the temperature with your hand and see if the bigger one is cold. If it is it means your compressor is making that humming sound. but i need more info. could be a number of things bad contactor.

Aug 13, 2011 | Heating & Cooling

1 Answer

I have a Tempstar 5000 that is about 15 yrs old and the fan motor to the outside unit will suddenly stop working and the compressor will start making a loud humming sound that does not sound too good. I...


Hello
Sounds like the condensor fan motor is going bad.If the fan stops turning or is not turning at full speed, the compressor can not give off heat to the condensor.Which will cause it to shut down on high heat.

So i would start with a new fan motor.Your local heating and cooling supply house should have these in stock.

Aug 01, 2011 | Heating & Cooling

2 Answers

I have a goodman gsc13 ac unit about 4 year old. When the temp gets around 90 or above outside the fan on the unit starts but the compressor does not. I had service check it out but that day they were...


It sounds like the unit may be over charged. Make sure the outside coils are clean and you have plenty of airflow coming out of the top of the outside unit. What could be happening is, when the temps get higher outside, so do the pressures in the system. The compressor has a thermal overload protection that will kick the compressor off if it gets to hot, which if the compressor is over charged, it will work twice as hard, over heat and shut off. You would need a technician to come out and get the refrigerant charge back to normal. Another thing that could be happening is a weak or faulty capacitor, which is a small round or oval metal object, found in the electrical compartment on the unit. This are fairly simple to change out if your comfortable with electric. I've also had to put what's called a hard start kit on compressors with the same problem, new and old. The hard start basically gives it that extra boost of power to get it up and going. I would start with the refrigerant charge and go from there. The electrical "humming" sound that you hear unless you turn the breaker to the furnace off, is the contactor on the outside unit having a call for cooling. The 24 volts come from the furnace, to the outside unit, and pulls the contactor in to power the unit with the 220 volts supplied. It is normal and you don't have to worry about that at all. I hope some of this helps and good luck!

Jul 05, 2011 | Heating & Cooling

1 Answer

Fan is working, the unit outside is making a humming noide, but NOT working


sounds like the outside unit fan is not working. it can be two things: the fan motor or capicator. Hope this helps tim

Aug 26, 2010 | Carrier 36KCARMS Air Conditioner

1 Answer

Carrier Compressor Issues?


When you shut it off and back on it slugged the compressor if you turn it off and back on before the pressures equalize between the high and low sides it will slug the compressor and it will not run should let sit for five minutes or so before restarting. The humming is either the compressor making noise usually common for the compressor to make some noise or the fan motor bearings are getting bad on the outside unit. If the unit works normal probably not much you can do till it breaks if it is the compressor it is more economical to replace the whole unit if it is just the fan motor it is worth changing. You could take an amp draw on the fan motor and the compressor to see if the are within the limits on the name plate of the outside unit.

Jan 25, 2010 | Heating & Cooling

1 Answer

Air Handler Blower Unit Humming


More then likely it's the transformer. It may be getting weak. I've seen them hum/vibrate almost new and last for years. It's more an annoyance than anything.

Jan 18, 2009 | Heating & Cooling

2 Answers

MY AIR CONDITION ONLY PUT OUT WARM AIR EVERYTHING SEEMS TO BE OK FILTER TURNS ON OK BUT THE OUTSIDE UNIT HUMS BUT DOES NOT FAN


Sounds like a bad start run capacitor. The exhaust fan motor may be bad too. Be careful, this unit delivers 220volts of electricity.

Jun 17, 2008 | Goodman Heating & Cooling

1 Answer

Fan not blowing


Even when the power is off at the unit outside the thermostat will supply power to the contactor of the outside unit. This may give a hum or buzz as you stated. If when the power is on to the outside unit the fan tries to start but only hums the motor may be bad. Does the compressor start and run?

May 06, 2008 | Weather King 10AJA2501AH Air Conditioner

Not finding what you are looking for?
Ruud UBHC Air Conditioner Logo

444 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ruud Heating & Cooling Experts

Donni Steen

Level 3 Expert

659 Answers

Bill Long

Level 3 Expert

587 Answers

Tim Whalen

Level 3 Expert

3074 Answers

Are you a Ruud Heating and Cooling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...