Question about Carrier 38CKC030 Air Conditioner

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The upstairs unit is freezing up, full charge, no filters and all vents are open.

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No filters hmmm. i suspect a dirty evaporator low air flow freeze up. Good luck Tom

Posted on Jun 26, 2009

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Unit comes on then freezes up around exposed coils?,,what to do?


Make sure filter is clean and all supply air vents are open. The indoor coil could be clogged with dirt. You may need serviceman to check for proper freon charge.

Jan 04, 2010 | Carrier 38CKC036 Air Conditioner

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Why does my A/C blow little to no air, that's not cold, and how do I fix it?


Air Conditioner freeze ups cause an A/C to blow little to no air through the vents, and the air is usually warm.

There are three basic reasons for air conditioner freeze ups:
  1. Insufficient air flow
  2. Low Refrigerant charge
  3. Outdoor temperature
1) The two most common causes of insufficient air flow are dirty filters and under sized ducts. A dirty filter limits air flow which in turn allows the cooling coil’s temperature to drop below freezing. Replacing the filter, monthly, usually alleviates this problem. Under sized ducts will also cause the system to freeze because it also limits the amount of air flowing over the cooling coil. This results in lowering the coil temperature and allowing the humidity in the air to collect on the coil and freeze.

2) Low Refrigerant Charge. The refrigerant system teeters on a delicate balance. If the system is not charged correctly, the system will not function properly. This malfunction may result in the poor cooling output and/or freezing up. Only a qualified, certified service technician can properly test and charge a refrigerant system. Check your small high pressure line (should be hot) and low pressure line (should be cold, but not frozen).

3) Outdoor temperature. If temperatures are too low, the system will not operate properly, and freeze up may occur. The outdoor unit does not function well in temperatures below 60 degrees F. A special “ambient temperature” control must be installed to allow the unit to run properly in cool temperatures, or you may open your windows and save energy. If the A/C is set lower than 70 degrees F, special adapters are required to be installed.

on Jul 10, 2010 | Heating & Cooling

2 Answers

Is it ok to replace outside unit of central air and heat and not the inside air handler ? The upstairs A/C( over 10 yrs old) is not keeping up with South Texas heat. The temp upstairs climbs to 84-86...


I'm assuming you have had a competent Air Conditioning contractor look your unit over.if you trust your A/C contractor, why don't you work with them towards an answer? I would get an air flow and sizing analysis, a full equipment service/performance check, and see if there is something simple causing this dilemma. Possibly low refrigerant charge,or you have a filter or coil restriction on the indoor unit. I've seen mold plug a coil solidly before. And due to new federal regulations on air conditioning efficiency and the phase-out of R-22, I would recommend that any replacement equipment be done in full, not part and parcel. The newer two stage energy star rated cooling and/or heat pump offerings are a fantastic solution for premium indoor comfort, and the government is offering powerful incentives right now if you're in the market.

Aug 18, 2009 | Heating & Cooling

1 Answer

Ac unit keeps freezing up owner says only at night


A/C's freeze up due to low air flow or low refrigerant charge. Check your air filter and make sure all your registers and vents are open and not blocked. You may need a service tech.

Aug 13, 2009 | American Standard Heating & Cooling

1 Answer

One of 2 Lennox AC units not working well.


check the filters if it needs cleaning....or check the refrigerant level if it is below normal

Aug 11, 2009 | Heating & Cooling

2 Answers

My attic air conditioner will stay at 81 degrees in the hottest part of the day only when it is sunny when it is cloudy it works fine I have a small 900 sq foot ranch


if the difference in termperature is between 15 and 20 degrees between the inlet and outlet, the unit is doing all it can and is undersized. if not check for airflow problems, filters, dirty coils etc. and if that is all good, then there may be issues with the refrigerant charge

Jul 12, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

I just had new vents run in the basement and even though they are closed, it will not cool the upstairs. It is 80 degrees upstairs. What is the problem?


First when you add new vents make sure your unit is big enough to handle the extra load. If you have shut off your vents to the basement. and it does not cool you may have AC problem. Sounds like you need to get it checked. Ask for a free estimate before you commit anything. Remember if they add gas you have a leak and it should be found. Rus When your ac does not cool properly check filters float switch in unit. Breaker on outside unit. Take a thermometer and take a reading from the reurn to the closest vent you should have between 17 and 21 degrees diference across the coil. If you have electric heat or heat pump you may need have a heat sequencer stuckmkeeping part of the heat on during cool.

Jun 26, 2009 | Carrier 38CKC042 Air Conditioner

1 Answer

Tran A/c installed last summer


It's the ducting that causes the problem. But if the old unit wasn't as bad, did they install a smaller unit to save on money? It is possible, some companies do this to make more money. Sad but it is true. A return added to the room would help but if they can run a return, then they can add another duct or reduct the room as well. Sounds like someone is trying to sell you a story without fixing the issue. Tell them that they don't need to add an extra run, tell them to change the size! Also, make sure that if the run is longer than 25 feet, the ducting has to be stepped down in size to increase valocity to the vent. For example, you have a 10" duct running for 25' and then you step down to 8" the rest of the way unless that run is more than 25'. Hope this info helps!

Apr 02, 2009 | Heating & Cooling

1 Answer

Air conditioner line freezing up


Check to make sure the filter inside the air handler is clean and that no vents are closed or blocked by furnature or rugs. Check the air handler to see if the blower is operating. You could have a belt off, the door switch could be in the open position or something simple like that. If this checks out OK., you will need to have a technician check the charge

Oct 07, 2007 | Goodman CLQ36AR49 Air Conditioner

2 Answers

Air condition freezing up


Make sure the condensate drain is clean and clear of any debris. With the indoor unit off, Remove the inspection panel and pour a gallon mixture of 10% Bleach to Water solution in the drain pan. Do not overflow the pan but check to make sure there is flow to the outside or drain. Clean out the drain hose if you have to. A freezing coil is a sign of either not enough air going across it or not enough charge in the system. Check to make sure all of the return air vents as well as supply vents are in full open and unrestricted. If they are, you will need to have the charge checked. If this turns out good, have your technician install an anti-freeze kit. This kit will temporarly turn off the compressor unit for a short period when the sensor in the kit experiences a freezing condition. Then after a bit, it will turn on the compressor. It may not cool as much as it was, but it may get you thru. Good Luck!

Sep 14, 2007 | Heating & Cooling

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