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The outside unit refuses to come on resulting in no cooling in the inside

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You have an electrical problem. It is either a lack of 220 volts getting to the outside half of the a/c or the 24 volt circuit not activating the contactor (big relay) that carries 220 to the compressor.

Posted on Jul 23, 2008

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My breaker trips when the outside unit tries to turn on. The inside furnace runs. I cut the inside unit off and the breaker doesn't trip. I manually turn on the outside unit by depressing the cont


Hello, there is a short to ground somewhere, check all the wiring from the inside un it to the outside unit and make sure nothing is touching metal.

Jun 10, 2012 | Goodman Air Conditioners

1 Answer

I have a LG Artcool LAN121HNP the unit will only ciculate air (not cool) it is only 2 years old. I have had an HVAC guy look at it, he says the compressor is fine. We have put a new board in the outside...


Make sure none of the thermostat wires from the inside unit to the outside unit have come loose or have be cut by a weed eater or such. These units are a little more complex than your average heat pump.

Aug 24, 2010 | LG Art Cool LA181CNW Split System Air...

1 Answer

I tring to change thermosat I can not remeber what color go where


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Feb 09, 2010 | Air Conditioners

1 Answer

Trying to figure out thermostat wiring diagham on a split system


Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

Jan 05, 2010 | Air Conditioners

1 Answer

Goodman Air (outside unit)


was there any refrigerant loss? "bumping" that results in movng usualy causes a leak.If the system is totally empty, It shouldn't start.. If it did major oh nos! will appear. Does it not start all? and was it running when it got thumped? May have to call a tech out on it. Sorry.

Jul 29, 2009 | Goodman CKL42AR42 Air Conditioner

1 Answer

Uotside unit blowing cool air but hot on the inside


It sounds like you have a unit called a heat pump. When a heat pump unit is in cooling mode the outside unit blows hot air and the inside unit blows cold air. If the outside unit is blowing cold then the indoor unit is most likely blowing room temperature or warm air. It sounds like the thermostat could be controlling incorrectly or you could have a failed reversing valve which is the device that switches the unit from heating to cooling mode.

May 31, 2009 | Ruud UBHC Air Conditioner

1 Answer

Outside unit not working


If the heating and cooling is working O.K. and maintaining the proper temperatures it is possible that your outside unit is in its off cycle. If the inside unit is running and the outside unit is not with an elevated temperature inside check the power supply to the outside unit. Most units have a disconnect located near them. Check the disconnect and make sure it is set to the on position. Listen for a hum noise at the outside unit which could indicate that the control power is being supplied to the contactor.

Jun 15, 2008 | Samsung AS18A6RB Air Conditioner

1 Answer

I have a colman ac unit and the outside unit will not come on. i hear it clicking but nothing happens


On my computer screen these two problems are not the same.

To "garys2003" Clicking you hear is the contactor closing in calling for cooling. If no power is being supplied to the outside unit high voltage the unit will not run. Check your circuit breaker or fuses in the outside power box. If the outside power box is of the non-fused disconnect, check that the disconnect is inserted properly.

To Trenina: Is your unit a self contained unit outside ducted to the inside as with a Mobile Home. If so your evaporator cooling coil may be frozen over stopping air movement, turn the cooling off and set your fan to on until it defrosts, then return to normal operation and leave the fan on during cooling.

If nothing comes on inside as with a central A/C system you may have a problem with the blower motor itself.

May 12, 2008 | Air Conditioners

2 Answers

Lg ductless no ac


I may not be of much help but I may be able to guide you into some diagnosos. If there is a communication problem between the inside and outside unit, both on the inside and outside units a colored LED will bling 5 times then pause for 3 seconds. The 33 and 44 codes are confusing to me because I have never seen this. Try resetting the outside unit with no call for heat or cool from the inside unit. After about 20 seconds, restore power to the outside unit. Go in and turn on the remote and make sure you lower the cool setting more than degrees cooler than the room temp. After 3 minutes the outside unit should turn on. If you get an error code of either 1, 2 or 5 blinks document it for the technician. If you continue to get your 33 and 44, you have a bad control board. If all else fails, press and hold the button located on the lower left side of the art unit and hold for about 5 seconds. If it still no longer works, now you will need the help of someone who knows these units.

Sep 08, 2007 | LG Art Cool LA121CNP wall/window Air...

1 Answer

No cooling after power out, indicator lights pattern not in manual


The Mitsubishi units have to be reset by turning off the indoor units by switching the remote or thermostat to off. Then turn off the breaker to the outside unit(s). After 30 seconds,turn on the breaker and then you can turn on the remote for cool. If no lights come on on the inside units, most likely you have blown a fuse soldered on the main PC board. At this point, call your technician. A goos tech will be able to wire in an in-line fuse holder so if it should happen again, you can easily replace the fuse. If you do see a light or two come on at the indoor unit but the outdoor unit does not start after 3 or 4 minutes, sounds like you will need to call a technician. Most likely you have a blown fuse on the main PC board of the outside unit. It is not an easy one to replace. Good Luck!

Aug 31, 2007 | Mitsubishi MSH09TW Air Conditioner

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