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Aircond works on cool but not heat. Defrost light on but a/c not frosted up.

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"defrost" is a function of a HEAT PUMP, not the same as an air conditioner because it uses the compressor to both heat and cool. It is not unusual for the defrost control to fail which would allow the cooling to work but not the heat cycle. A qualified service tech should be able to diagnose the fault within the diagnostic phase of a service call and recommend corrective action.

Posted on May 03, 2008

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Hi, I have an LG artcool A09AHD aircon unit and after a while on the heat cycle, the unit stops and shows a circle with a snowflake and a waterdrop within the circle. Does anybody know what alarm tjis is?...


This may just be the defrost cycle for the outdoor unit. In the heat mode, the outdoor unit builds frost on the coil. The outdoor unit senses how much frost has built up on the coil and reverses the refrigerant cycle to allow the outdoor coil to warm up and defrost it. After a short period, the unit then restores itself to the heat cycle. This is normal operation and nothing to worry about. During the defrost cycle, you may feel some cool air inside your home.

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Frost on the outdoor coils is normal...it will defrost them as neccesary...

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I have a aircond / heat pump unit. When in the heating mode it run for about10-15 minutes and you hear a small bang and here a rush of pressure in the aircond lines and the the unit seem to be running in...


Hello,Your heat pump is in DEFROST mode and this is normal(only during a call for heat).When in defrost mode the supply air temp should still be warm as 1st stage electric heat strip comes on during the cycle.If the unit did not defrost every once in a while the outside unit would look like a snowman after a while.The reversing valve is the "bang" when it changes over.

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The outdoor coils getting some frost on them is normal. However the system should periodically (every 30-90 mins of run time) go into "defrost" mode. Essentially it reverts back to cooling and shuts off the outdoor fan. This heats the coil outside to melt the frost. You may see some steam at this time also. Again normal. If this is not happening or not happening often enough the coil will ice up. Inside the outdoor unit is the defrost board. There is usually a pin setting for either 30-45-60 or 90 minutes. Make sure you kill the power to the unit before sticking your hands in there. Check to see what setting your is on and lower it one peg. If it's been colder and/or more humid you may need to cycle sooner. Good luck I hope this works for you. Please don't forget to give me a Fixya rating.

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In your climate usually the defrost timer would be on 90. However if you are in an upper elevation and it gets colder then set it at 60. what model unit do you have? Did they change both indoor and outdoor units? I would have to know the model # to tell if the fan should run in defrost. In most cases I would say no.

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1 Answer

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I assume this is a heat pump. The outside unit may be icing up. It should have a defrost cycle with electronic control that sometimes fails or sensor associated with the electronic determination of when to defrost may have failed or may not be sensing because its out of position. You can check for a defrost problem. If frost is blocking the outside unit air will not pass through it after the frost builds up and you may be able to see the white frost as well. If all this is true you need to get a service manual and use its procedures to find out why the unit is not defrosting.

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