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My central air unit keeps freezing up on the inside

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1) locate the A-Coil (A-frame) inside the furnace. It is usually located in the furnace supply plenum located on the "down" side of the furnace plenum. If it is very dirty, there will be poor air flow generally in the house. This can cause the A/C to "freeze up" as the refrigerant is not getting enough heat to convert the refrigerant to a gaseous state.

2) The unit may be low on freon (or whatever refrigerant you are using). Contact a serviceman to check the unit.

Posted on Jul 08, 2008


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Posted on Jan 02, 2017

  • 1515 Answers

SOURCE: i have an 80,000 btu ruud furnace and a trane

Hi, here are a few things that will cause a unit to ice up, and I see you have checked some, but I will go through it. Not enough air flow across the indoor evaporator coil, a dirty evaporator coil, lets say the filter had not been changed by the previous owners the dirt will cave the filter in and collect a sheet of dirt over the coil. This is the hardest coil to check and clean, but I have cleaned many of them to stop the ice build up. You say the unit has been cleaned. As far as the fan motor, it must be plugged into the high speed terminal on the circuit board in the indoor unit. This motor that was replaced should have 3- speeds. High is used for cooling and low for heating. You will see the other leads wire tied together out of the way. Colors depend on the motor for speeds, but will tell you if you are able to slide the blower out enough to see the data plate on it. White or yellow are normally L-1 or L-2, speeds are normally blue, red, and black. The wires may also be marked for what speed they are. Look on your board and you will see where the wire for the blower speed connects, it will say HI and LO. When you check these, turn it on and you can tell if the motor is running higher or lower then before. It will switch over speeds automatically to heat when its winter through the board. Motors are different in wires they use for speed colors or I could tell you, and its not the oem motor ( factory ). Blue is normally med., low is red, and high would be black, but like I say, yours may be different. Anyway, the speed, dirty coil, low on freon charge is # 1 cause. Also, make sure you don't have another filter somewhere in the home ceiling or in the retrun air stream somewhere hiding. If you were able to put a set of gauges on the unit, it would tell you right away if this coil was dirty enough to cause it to ice as the low pressure would be down to around 30 p.s.i.and a normal head. Low on freon would be a low high side and low side pressures. Check your suction line at the outdoor unit, the insulated larger of the 2-lines for ice. If you have ice there when all is melted off first, and it starts to ice there, its probably low on charge. You have a 80,000 btu furnace, but if you look at the model number on the outdoor trane, it would tell me the size of it. You will see a number such as this, 024, 030, 036, 042, 048, and 060. This will tell you the tonnage of the condenser trane unit. Here's how to figure it. There are 12,000 btu's per ton of cooling. Look at the numbers and find yours. multiply 12x2=24 a 2- ton unit, 30 a 2 1/2 ton, a 5 ton unit would be a 060. I just wanted to teach you more then anyone else will no unless they were a service tech. Why I wanted to no the tonnage is to know if the unit has a TXV ( Thermostatic Expansion Valve ) for metering freon into the coil or a fixed device. If the TXV happens to get a restriction, it will cause the indoor coil to be starved of freon and not flooded as it should be and ice up. This is rare unless at the factory when brazing a tiny piece of solder is floating around and plugged it up. I have seen this. About all that you can do on your own, is to make sure the fan is on high. The connectors at the ends will have a plastic cover over them to prevent shorts. All you need to do is unplug 1-wire and plug another in. If not sure, do each one from motor and test by hearing. You may have a door or panel switch on the perimeter that will kill power when removed. If so, tape it down to restore power. Make sure the indoor coil has no insulation stuck on it, this happens, the new blower motor is OK. The best way to de-ice a coil if you have a gas furnace is to turn on the heat! This will melt the ice off very fast so you have flow again until you find the problem. This is when you want to check the outdoor lines when all is defrosted. If it starts to ice when you turn it on, more then likely you are low on charge. I am sorry for such a long solution, I do this to try and teach the owner a little about there units and how they work. Please be kind when you rate me, this would be very good of you. I will be here if you need me. Keep me posted.
PS If at all possible, make sure you have no return air ducts that have been flattened by a cable man or phone man. This is a big problem here where I live. Thay will put there knees on it or crawl on it and restrict the air coming back causing it to ice also. Think back if any one was under or in attic, where ever they are. Also, cats will rip them open and other critters. Just covering all the bases.
A/C & Heating Contractor

Posted on Jul 02, 2010

  • 828 Answers

SOURCE: My AC unit keeps freezing

Operate your air conditioner with the fan in the on position. But first turn the fan on, turn the temp up or shut the cooling off. Your coil is more than likely frozen over. At night when outside temperature drops the refrigerant pressure and temperature in the system also drops. This action can cause icing of the cooling coil, with the fan in automatic everything shuts down at the end of a cooling cycle. Thus no air movement to melt ice on previous cooling cycle.

Posted on May 09, 2008

  • 943 Answers

SOURCE: coils freeze up inside the

hi thanks for the question i would check the air filter very important very important most common problem also check the drain from te evaporator it could be clogged thanks the appliance doc

Posted on Sep 27, 2008

  • 3361 Answers

SOURCE: central air conditioner doesn't cool

The capacitor is located inside the control panel on the outside unit. It is round or oval and silver in color.It runs the outdoor fan and the compressor both.
The terminals are marked= C, /F or fan/, H or herm. C-F-H.
The microfarad rating is printed on the capacitor. Make a color code wire diagram before removeing wires.
Disconnect power to the unit. Use a insulated screwdriver to short out the terminals on the capacitor before removing it.

Posted on Apr 27, 2009

  • 1902 Answers

SOURCE: central air freezing up

Low freon causes this problem. It could be the compressor going bad, but 99% of the time it is that the freon is low, have it leak tested and also have freon added

Posted on May 23, 2009

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Hope this helps ya please rate me.

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