Icing of the fins of my lg aircondtioner indoor unit

ice on indoor units can be from blocked evaporator fins / blocked filters
inspect the fins under the filter pads and if they look greasy and dirty have the indoor unit professionally cleaned as it is messy

Check the air filter and if it is dirty, replace..
Turn equipment off and let the ice melt.
After ice melts, place a/c in cooling mode and set the thermostat to 3 degrees below room temp display.

The indoor unit fan should start blowing cold air immediately and then turn off once the room temp drops one degree below the cooling temp setting.
If the indoor unit does cycle off, check the outdoor unit and make sure it turns off at the same time.
If the outdoor unit continues to run and the indoor fan is not running, the indoor unit will ice up.
A defective compressor relay that is stuck in a closed position will cause icing of the indoor unit because it keeps the compressor running when it should turn off with the indoor fan.

Do you have an error code being displayed on the controller?
Is there an led light that is flashing on the indoor unit?

Another possibility causing the indoor unit to ice up is if the freon in the system starts to get low.
Make sure the ice has all melted for this next check.
Pretty easy to check without special tools.
If the air filter is clean and there is no dust/ dirt blocking the fins on the indoor unit, turn a/c back on to cool and check that the indoor unit fan comes on and is blowing air good.
Once everything seems to running good go to the outdoor unit.
There will be two lines with black rubber insulation covering them.
Peel back the insulation three inches on each line and observe the copper lines.
If either line starts to frost up the a/c system is most likely low on refrigerant.


Another cause of indoor unit icing could be that the aluminum fins behind the air filter are clogged with dust or other foreign material.
This would block the air that must be pulled in causing the indoor unit coil to become too cold due to lack of air flow and it will ice up.

Operating the cooling system when the outdoor temperature is below 60 degrees can cause the indoor unit to ice up also.

I'm Robert.
Florida certified a/c contractor. 30 years experience.
Hope this helps.

indicates dirty evaporator fins that are icing up
that will overload the compressor and trip it
the ni oise you hear is the ice breaking up and the splashing is excessive water in the blocked drain that cannot run outside
get in a technician to clean and service the ac

mcdevito75 here, Possibly, the filter needs cleaning / replacement, unit set to too cold. Shut A/C off, let the ice melt on it"s own DO NOT REMOVE ICE YOURSELF, those coils have the fren gas in them, when the ice is all melted restart unit, set temp. not so cold, around 60--65 degrees, and have exhaust to out. This shpoul;d help, you can always check with your local A/C repair shop, they come to the house.

I think the more likely problem is that the unit is slightly short of gas\ refrigerant, which is a common cause of icing up evaporator coils and this sound you describe. First check that the air filter is clean. Another cause could be the defrost sensor is faulty, but I would think not. Some ice isn't actually a bad thing, but quite common as long as it doesn't form over too much of the coil, or get too thick.

It sounds like your defrost controller has gone bad. I have an LFC25760 and had ice build up in the bottom of the freezer such that water would start leaking onto the floor. The ice build up in the bottom of the freezer was due to a failing/bad defrost controller. Behind the back white wall in the freezer compartment exists the cooling fins along with a heating element underneath. Due to moisture that comes into the freezer from opening it, frost/ice builds up on the cooling fins. Thus the defrost controller turns on the heating element to melt the ice/frost off of the fins which then drips into a metal pan which channels the water to a drain hole which drops into the drip pan underneath the fridge next to the fan. The problem is that the defrost controller doesn't keep the heating element on long enough or the cooling cycle comes on too soon thereby freezing the water and plugging up the drain. I had my defrost controller replaced (just outside the warranty period!) and it worked for about 1-month and then same thing happened again. Instead of paying for another defrost controller that would probably not work 100% my serviceman used the old paper-clip trick. He took a paper clip, stretched it out and then wrapped one end around the heating element and placed the other end into the drain hole. Thus when the heating element comes on the paper clip keeps the drain hole warm/hot and prevents the water from freezing. It has been 9 months since this fix and I haven't had any ice pooling in bottom of the freezer.

you need to have the unit checked for the amount of freon in the system this must be done with a gauge set the freon amount is obviously incorrect
also the a-frame evaporator must be sealed in the furnace cabinet

hi! there,
eventually ice freezing evaporator occured two factor you have
dirty fin evaporator and undercharge system.
1. undercharge can easily detected using clamp
ammeter clamp on one line of evaporator while running
read the amper the compare this to yuor service
manual the rated current of the compressor.

2.if the reading current is below the rared current on
manual or there is tag on the body of unit specified
rated current.your unit need to recharge.

if has the same current no change at all freon is still
good, this only need cleaning of eveporator fin.

clean this by pressurise water to purge out all debris
particle on fin tube of evaporator.

cracking sound usally made by blwer or fan
misalignement or distorted bearing blower .



regards have anice day dont forget to rate me.

Check the indoor fins and air filter if dirty, so if its dirty cleaning is needed specially the indoor fins it should not be block with dirts. But if it is clean then you need a qualified technician it may need additional gas.

- Check your air filter at the indoor if clean.
- Check your evaporator fins if clean.
- Check if no icing in your evaporator and outdoor pipes.
- If your air filter and evaporator fins is clean and icing is present then your unit is under charge.
- When your indoor drips check your drain pipe if there are water comes out. If no water drain from your drain pipes then your drainage is restricted.
- Flush your drainage with water using your garden hose to flush out dirts from your drainage.