Question about GE Quiet-Aire Ductless Split System Air Conditioner AS1CD12AA0/AS0CD12AA0

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Coils freezing up!

The refrigerants is related to a system preassure and temperature relationship! If too low preassures the refrigerant cools too low.. If just right it will stay above freezing temperatures ((32*)) If too high of a preassure, or too much refrigerants ,the temperatures will stay too high and not cool down the return air at manufacture specs. and not remove the designed btu's and humidity... ....(bottom line, just check out a reputable hvac serviceman.) Oh yes, also low air flow across the indoor coils!

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Outdoor coils dirty creats high head pressure which in turn destroys a hermetic compressor for the fact that a hermetic compressor uses Superheated vapor to cool windings..Your post is so vague but for the fact you advise a service tech...

Posted on Jun 12, 2008

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Posted on Jan 02, 2017

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A copper thin tube from the unit is very hot. Is it normal?


Yes, well somewhat normal. The refrigerant leaves the compressor at high temperature and flows through the condenser coil where it cools about 20 degrees warmer than the outside air flowing through the condenser. Many small air conditioner units use a small copper tube (capillary tube) of a specific diameter and length for that system to cause a decrease in refrigerant pressure between the condenser and the evaporator. The refrigerant leaves the compressor as a gas at high pressure, cools in the condenser and changes into a liquid. The liquid flows through the cap tube and cools more as the pressure decreases and gets closer to the evaporator. The refrigerant boils and evaporates under the low pressure of the evaporator and turns back into a gas. That gas is pulled back to the compressor.
If the condenser is not cooling the refrigerant enough, the tube can become extra hot. Efficiency is reduced. Actual temperatures throughout the system depend on the type refrigerant used, suction and discharge pressure at the compressor, outside and inside temperature. Tables, charts and graphs for various pressure-temperature relationships can be found in refrigeration books and chemical web sites.

Mar 17, 2015 | Carrier FB4ANF060 HVAC Electric Unit & AC...

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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

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Why your unit is freezing up.


To understand why your AC or heat pump is freezing up, it helps to know how your system works.

There are 7 major parts to an AC system, 9 with a heat pump.

1 - Condenser/heat pump (The outdoor unit)
2 - Air Handler (the indoor unit unless the system is a package unit, then all is outside in one system. The air handler is usually found under the home, in an attic, or in a closet.)

In the condenser are the following major parts.

3 - Compressor
4 - Condenser coil
5 - Condenser fan
6 - (HPs only) reversing valve

In the air handler are the following major parts.

7 - Blower motor
8 - Evaporator coil
9 - (HPs only) electric heat strips

Some systems known as "dual fuel systems" use another heat source in place of the heat strips, usually a gas furnace. I will address gas furnaces in another post.

When an air conditioner is operating properly several things are taking place.

1 - The compressor is compressing or "pumping" refrigerant through the system.

2 - through changes in pressure, the refrigerant makes the evaporator coil get very cold, and the condenser coil gets very hot.

3 - The blower motor/fan circulates air across the evaporator coils, as the room temperature air (Also known as "indoor ambient") goes through the cold coil, it exits, cooled approximately 15 to 20 degrees cooler than when it entered. (In a ducted system, the blower is also the fan that circulates the air throughout the home.)

4 - The condenser fan circulates air across the condenser coils. As the outdoor air goes through the condenser coil, it removes heat from the coils that are very hot. This in turn removes heat from the refrigerant so it can run its cycle again, and through pressure changes, cool the evap coil.

5 - With a heat pump, the reversing valve reverses the flow of refrigerant in the condenser and evaporator coils.
In AC mode, the evaporator coils get cold, and the condenser coils get hot. But in heat mode, the evaporator gets very hot, and the condenser very cold.

Now, whichever coil is getting cold will freeze up if there is inadequate air flow across the coil, as the refrigerant in it is far below freezing, and there is not enough airflow to keep the humidity in the air from freezing on the coil.

Things that can cause poor airflow are,

1 - Dirty/clogged coils
2 - dirty/clogged filter (will only effect evaporator coil)
3 - Closed/blocked vents (will only effect evaporator coil)
4 - Malfunctioning or dirty fan

Low refrigerant will also cause a coil to freeze up, reduce efficiency and cause the system to run for long periods of time. Not to mention, shortening the life of the unit.

With a heat pump, in heat mode only, the condenser (outdoor) coil will routinely begin to freeze up in cold temperatures. This is due to the fact that the refrigerant is below freezing, and the cold outdoor ambient temp is not warm enough to keep the condensation in the air from freezing on the coil.

Note, a properly working AC should never freeze up.

A heat pump is equipped with defrost controls to prevent ice buildup.
Some are controlled by timers, some by temp.

When a HP is going into defrost mode, the condenser fan shuts down, the reversing valve reverses the flow of refrigerant and the once cold condenser coil now gets very hot, defrosting the coil. (Many people have said this process sounds like the unit is coming apart, or about to explode and are frightened by the "smoke" which is really just steam from melting ice that comes off the unit.)

During defrost mode, the secondary or "auxiliary" heat comes on to ensure that you are still getting warm air from the vents. (Again, this can be electric heat strips or a dual fuel system)

If you are experiencing cold air from the vents during defrost, that means your auxiliary heat is malfunctioning.

The auxiliary heat is used for three purposes.

1 - during defrost mode to maintain warm airflow (automatic)
2 - when the HP cannot maintain the set temp due to extreme outdoor temps. It comes on when the indoor temp drops several degrees below the set temp on the thermostat (automatic)
3 - For emergency heat source when the HP is not working. (Manual)

To recap....

Iced up coils?

Poor airflow
low refrigerant
Malfunctioning fan
failing defrost system


There are two things that can be done in a pinch to help de-ice frozen coils. This may get you by until the repairman can get there, or you can fix the system if you are a do-it-yourselfer.

HPs frozen outdoor coil in heat mode, not going into defrost?

Cover most of the vents, and turn the system onto cooling mode until the outdoor coil is thawed. then uncover vents and return to heat, or emergency heat. (this usually takes 15 min or less)

Frozen coils in AC mode with a heat pump?
Turn the system to heat with the thermostat on just high enough to get the system to come on. (again, usually takes 15 min or less to thaw.)

AC only, with frozen evap coils? (this can sometimes be seen frozen all the way outside to the compressor on the copper lines.)

Turn the system off, and the fan switch from "auto" to on".
This will usually defrost the coils within 1 to 2 hours.
(If your system has the furnace in line before the evap coil, turn the system to heat, and the furnace will defrost the coil within minutes.)



on Dec 25, 2008 | Carrier XHB123D X/Y Series Heat/Cool Air...

1 Answer

New install model ks1872 and cl1872 unit suction line frosting up proper amount of freon is in system. what can cause this indoor fan is on high speed and running


There are three things that will cause a freeze up in an a/csystem. One is low refrigerant charge, another is low airflow across theevaporator coil and the third is a restricted expansion orifice or valve.

First thing to do it check the airflow across the coil. The rule of thumbreads that you need 400 cubic feet per minute (cfm) of airflow for every oneton of cooling, or 12,000 BTU's. So if you have a 3 ton system, rated as 36,000btu's, you need to have 1200 cfm airflow in cooling mode. If the airflow is notcorrect then check the filter(s) and the evaporator coil for cleanliness. Aclogged filter or coil will cause low airflow. If your airflow is correct thenmove on to the refrigeration cycle.

To check the refrigerant cycle you need a set of service gauges hooded upto the condensing unit outside and temperature readings. The particulars arevery involved and are beyond the scope of this site and need to be performed bya qualified service technician. The service tech needs to verify that therefrigerant level is correct and the expansion orifice/valve is operatingproperly.

Jun 23, 2011 | Sanyo Heating & Cooling

1 Answer

I have an Ideal 24mini with a mega flow, I have water dripping from my discharge pipe. But the preassure gage keeps rising up even if I release some preassure freom the heating system. Iv checked the...


Hello It could be a bad/defective EXPANSION tank if it(valve) leaks when the burner is running and the pressure rises at the same time .Otherwise swap the valve as they can wear out.

Sep 21, 2010 | Heating & Cooling

1 Answer

My Kenmore 73069's inside fins often freeze up. I don't have it set very low: 75 degrees F. Why does this happen?


Your setting of 75F doesn't affect the freezing because it is a result of the boiling point of the refrigerant in the a/c unit. The lower the refrigerant pressure is, the lower the boiling point is and the refrigerant cools the coil to that temperature also known as saturation temperature. The 75F is what it lets the room air get cooled to before it shuts off. The freezing can also be caused by low air flow across the coil which can be caused by dirty air filters, dirty fan, dirty coil or fan not running/not running fast enough. So check your filters and the coil to make sure they are clean. Make sure the evaporator fan is running. Then you may need to get the refrigerant charge checked.

Jun 15, 2010 | Kenmore 73069 Air Conditioner

1 Answer

My airconditioner lines keep freezing up


Your filter is plugged, or the refrigerant is low, or it is getting too cold outside overnight (less than 60degf)

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)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.
3) Outdoor temperature. If night time 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.

Jun 05, 2009 | Heating & Cooling

1 Answer

Wall ac unit keeps freezing up inside.


No! You will not likely find any service on a product which has very little value. Frosting will sometimes happen if the outside temperature is to low. The outside ambient temperature is directly related to the pressures inside the refrigerating system. The lower the outside temperature is the lower the pressures will be in the cooling end of the air conditioner. In mechanical refrigeration pressures and temperatures are directly related.

Nov 02, 2008 | Goldstar WG5000 Air Conditioner

1 Answer

Haier central ac unit problem


HEY,Kim, connect the red hose with the crooked end on the small line service vale and the blue crooked end to the fat line service valve and read the preassure now. Also the yellow line connect to the refrigerant tank...!

Jul 09, 2008 | Haier Energy Star ESA3183 Air Conditioner

1 Answer

AC not producing cool air


If this is a newer system there will be a freeze sensor. It may be low on refrigerant. I would check the obvious things first. Are the filters and coils free of debris? Finally only set the temperature to your comfortable temp not lower as this can cause freezing too (generally not below 70 degrees)

Jun 23, 2008 | LG BG8000ER Air Conditioner

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