Question about Intertherm P3RA-048K Air Conditioner

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Indoor coils freezing up

Yesterday the coils on the indoor indoor unit froze up. I turned it off and let it thaw out, I tried running it again for a short time and noticed the coils were starting to freeze up again. what could the problem be?

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  • ladyleathern Sep 28, 2009

    Thanks, I did that all yesterday. Cleaned out the fins, they actually weren't that dirty at all, cleaned the filter, and I had turn it off until it thawed out because i couldn't get the filter off until it was thawed. So I guess I am just going to have to call someone out.

  • dhuhwhat May 11, 2010

    first it's a A/C so it could be many things. first thing to check is let it thaw.... again. and remove the air filter let it run for a little bit and see if it still freezes. post back with the answer please. Most likely if it's not the filter needing changing then it could be time to clean out the fins, or that part that keeps freezing. if it's not those you might have to wait on a a/c expert ro call one.


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You have a low refrigerant (leak) problem or poor airflow due to dirty coils or bad fan motor.
Maybe a combination of all 3.
Check the coils for dirt and lint. Check the fan motor blower wheel for lint on the blades. Check the condensing unit refrrigerant operating pressure. Low side for R22 should be approximately 68 psi, R410 pressure should be approximately 135 psi.

Posted on Sep 28, 2009

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Posted on Jan 02, 2017

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Air Conditioner Ice Air Conditioner Problem

If you are experiencing the problems caused when your air conditioner becomes a solid block of ice then you need to figure out the real reason why it does or is doing that.

There are a few things that can happen to cause this unpleasant happening.
  1. The air flow over the coil is choked off to the point where the coil starts to become to cool because not enough air is flowing over it to keep it warm.
    1. Check air filter, if dirty clean it. (This is a very common problem)
    2. Check supply vents in building to make sure enough are opened to allow air flow.
    3. Check blower motor to see that it is operating at full speed.
    4. Return air temperature may be too cool. (below 65F)
    5. The indoor coil it’s self may be plugged with dirt. Clean with a good indoor coil cleaner.

  1. The outdoor air temperature maybe to cool which makes the indoor coil run too cold.
    1. Install a head pressure control to keep the high side pressures up.

  1. The unit may be low in refrigerant. This is often the first thing that gets the blame for causing this problem. Actually it should be the last thing to check after all the other possibilities are thoroughly checked.

If you have a coil that is froze up to a chunk of ice, then you need to remove power to the outdoor unit. Allow the indoor fan/blower to run to try to move air over the coil and thaw it out.
After the coil is completely thawed, then restore power and determine the cause of the freeze up.
A heat gun or hair dryer can assist in the deicing process. Towels and a wet/dry shop vac can help to keep the mess to a minimum also.

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1 Answer

What is the problem when an air conditioner begins to freeze up?

Freezing up is caused by
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•dirty blower wheel or blower fan blades
•low freon
•weak or slow blower motor
If air filter and indoor coil are clean may be low on freon. Blower wheels seldom get dirty on window units. Pull unit from window and clean both coils with a water hose. Careful not to get any electrical wet. Let dry for a while and reinstall. If it continues to freeze its a freon problem most the time.

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Hello my name is Heath it will be my pleasure to assist you. First thing to do is turn the unit off and check the filter then if the filter is okay check to see if the blower comes on when you put the fan switch on the thermostat from auto to on. If the blower isn't coming on then there could be a problem with the blower motor. If the motor is running then turn the system to cool and turn the setting down to where the air should be on. Then check the outside unit and be sure the outside unit is running if the outside unit is not running go to the house panel box and check the breaker to see if any of them are tripped or off. If there off turn them on and check the outside unit again. If all is running and you get no air flow through the vents then the coil could be frozen. If the unit is frozen turn the thermostat to off and leave the indoor blower on by leaving the fan switch in the on position for a couple hours till it thaws. If the unit froze up then there could be a problem with the a/c system most likely low on refrigerant as a result of a leak. I would have it leak tested and repaired if this is the case.

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We have a LG model lwhd1009r. We cleaned out the unit and the coils are still freezing up and not cooling. We turn the the fan on and it thaws right away, but as soon as you turn on the compressor it...

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Have you changed your filter? It could be a dirty evap coil. is your fan on the inside unit turning and turning in the right direction. If you have a filter dryer check to see if you have a temp drop across the filter dryer this will be found on the liquid line on the out side. It could also be low on charge of freon.
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Either your filter was really stopped up or you could be low on refrigerant. If your filter was stopped up, be sure it is thawed out all the way with no more ice build up, and go ahead and turn it on. You may have already solved your problem. It it freezes up again, you will have to have your refrigerant checked.
The only other thing it could be would be a stopped up evaporator coil. This happens when the unit is ran for a long time without a filter or when the filter doesn't fit in the blower correctly.

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