LG LS246HV - Mini-Split Ductless AC Inverter Heat Pump 24,000 BTU Logo
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Ian Scrimgeour Posted on Feb 23, 2015

How can you defrost unit outside if already iced up and will not start

Unit was shut down, filled with snow which became ice in front of coil

  • Ian Scrimgeour
    Ian Scrimgeour Feb 23, 2015

    Had the wrong model number, it should be LSU18HSV

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5 Related Answers

Anonymous

  • 170 Answers
  • Posted on Apr 08, 2009

SOURCE: air conditioner is frozen on the inside

I would shut it off...most A/C's never need to defrost...but I'm not 100% sure about some of the newer models....In my 35 years experience.I have never seen a defrost on anything but a freezer/refrigerator....a humming noise indicates a motor is frozen up...usually a fan motor..in your case it will be the evaporator/condenser fan motor...(your type has a double shaft..that has a fan blade for the evaporator and then another shaft upon which the condenser fan blade is attached...if this goes out it will hum...and it will definitely ice over....and these window units are never supposed to ice over...except when air is not blowing over the evaporator ..or air is not blowing over the condenser. Yes it will continue especially if the fan motor is going bad...and yes keep power to it off..or the compressor can burn out and that IS THE AIR CONDITIONER...if you lose that you may as well buy a new one as the cost of repairs will be more than a new unit.....usually....If you are lucky you can take the cover off an spin the fan blade by hand and try to start it while the blade is spinning to see if it was just stuck...but it may not restart after it stops...if it doesn't you will need a new fan motor. Also next time include the Make and Model #. thanks and good luck...than you for rating my effort...the Fang.

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Jim Goldsmith

  • 2005 Answers
  • Posted on May 28, 2009

SOURCE: ice formation in the indoor unit

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

flatech

Michael McQuay

  • 111 Answers
  • Posted on Oct 25, 2009

SOURCE: icing up of unit

When you clean the Ac unit, Make sure to take the Unit completly out and clean both the condensor coil as well as the Evaporator coil.
If you are able to run the unit with it out of the window. See if there are any service ports connected to the unit (Guage hook ups), or any OIL spots where is looks dark, (Checking to see) if its leaking.

Wasnt sure how you cleaned the unit, So just make sure both coils are cleaned well with water, and make sure to avoid getting to much water into the Electronics.
Good Luck!

I’m happy to help further over the phone at https://www.6ya.com/expert/michael_341f3f9dee622e54

Anonymous

  • 767 Answers
  • Posted on Dec 20, 2009

SOURCE: Should the LG LS-K-1830CL outdoor unit ice over on

Running the heat pump in low outside ambient temps. will definitely cause the coil to ice up. An ouside temperature senor or a wind baffle should be installed in climates that get below freezing. This would definitely cause the heat pump to operate at lowered efficency and maybe not at all. It should go into defrost mode if the sensor is working correctly when the coil ices up.

motor1258

Mike Butler

  • 6674 Answers
  • Posted on Feb 03, 2010

SOURCE: icing of the fins of my lg aircondtioner indoor unit

Check/clean intake air filter and condenser fins,as well as be sure condensation drain is clear as well. Sometimes if not the right angle, moisture remains inside unit rather than draining outside, or wherever your drain is, make sure it's clear and draining well.

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Related Questions:

0helpful
1answer

Hear pump keeps running constantly, why won't it shut off?

if some units detect ice they will leave the fan running in an attempt to defrost the coils. If it's the outside coils and it's warm enough inside, try running the air conditioning for a few minutes, that will put hot coolant through the coils and could melt the ice for you.
tip

Why is Ice Forming on my Heat Pump

Many people have heat pumps and never realize that ice can form on the outdoor unit. Some have seen ice on their heat pumps but do not know how much is too much until they have a problem with not enough heat. Still others have a backup heat source and never know that they have a problem.

First off lets establish that heat pumps will form ice on the outdoor unit, usually whenever the outdoor temperatures go below about 40 degrees F. This threshold for ice depends a lot on the humidity of the air outside. If it is raining or snowing, the ice will form much more readily and rapidly. It is normal for ice to form on the outdoor unit because it is the cold side of the system when it is running in the heating mode. Because of this cooling, if the outdoor temperature is near or below freezing and there is moisture in the air, it will condense and freeze on the unit.

To keep the ice from building up to the point where it stops all the air flow, the outdoor unit will have a defrost timer board. This operates in conjunction with a sensor. Every 30 – 90 minutes the board will check the sensor. If the sensor tells the board that ice has formed on the coil it will then change the unit over from heating to cooling. This will make the outdoor unit the hot side for a short time to melt away the ice. While it does this, the unit will also energize the back up heat which is often an electric coil or a furnace. This will keep the inside air from blowing cold while the unit is defrosting.
When the sensor feels the coil temperature at about 50 degrees F it will then tell the board to return to the regular heating and switch the coils around again.

If this process fails to work for some reason the outdoor coil will become a big block of ice and look something like this.

8a765a2.jpg
When your outdoor coil becomes totally frozen over it stops all the air flow through the coil and stops the heating process. In extreme case it can be very difficult and becomes a very long process to defrost the coil. You need to practice a lot of patience and care when defrosting a badly frozen coil. A torch or preferably a heat gun (hair dryer) can be used to speed up the defrost process. If it continues to occur the timer needs to be set to defrost more often or either the timer or the sensor has gone bad.

http://www.fixya.com/support/r3563896-air_conditioning__cleaning_the_condenser

http://www.fixya.com/support/r3636724-r_410a_new_refrigerant_air_conditioning

http://www.fixya.com/support/r3636751-air_conditioner_seer_seasonal_energy
on Jan 30, 2010 • Heating & Cooling
0helpful
1answer

There is a loud humming coming from outside unit, the fan is not rotating.

Your question does not include what type of system you are asking about, but the assumption is that it is a heat pump. The loud humming is the compressor running by itself while the fan is off.

This is the typical way a reasonably new heat pump operates:
There is a coil temperature sensor that initiates a defrost period to eliminate the frost/ice build up on the outdoor coil. In the defrost mode, the outdoor fan shuts off and the reversing valve in the heat pump reverses the direction of refrigerant flow to warm the outdoor coil. The same coil temperature sensor senses the temperature of the external surface of the coil and tells the defrost control when the frost is gone initiating another 'reverse cycle' to put it back into heating mode. In the heating mode, the outdoor fan runs again.

If you have the heat pump installed where snow drifts accumulate, you will have a problem extracting heat from the outdoor air, and coil frosting and freezing will be exaggerated. If you have excessive ice build up due to a defosting issue, the ice can actually stop the fan from rotating, but you would hear loud bangind and rattling for hours first as the fan blades come in contact with the ice.

If you do not have drifts, but continually have an excessive amount of ice build up, either the sensor is possibly faulty or the defrost control board is faulty. The sensor's clip could easily have been knocked loose from the coil by ice and is no longer sensing coil temperature and if so the result would be the lack of defrost initiation.
0helpful
1answer

Why is my evap coil and fans covered in snow

Hello,

The heater is supposed to be on the inside of your drain line.
1helpful
1answer

I have noticed my heat pump is freezing up on the outside unit, we have had freezing rain and snow the last 2 days but I have never noticed ice accumulation on the outside of the unit, it also seems like...

In freezing weather the heat pump efficiency drops. The freezing is normal. The equipment has a board and sensor to defrost your heat pump. Now this system can fail but freezing rain and snow get pulled into the unit get pulled into the unit coil and freeze blocking airflow. You can defrost the unit by turning it to cooling. This is what the defrost board does automatically.
3helpful
2answers

The freezer isn't making alot of ice. Can the hose behind the ice maker freeze?

Hi and welcome to FixYa, I am Kelly.

When a refrigerator slows down ice production it is usually the result of poor air-flow through the evaporator coils. The poor air-flow is due to ice build up on the evaporator coils. The ice build up happens because the unit is not defrosting properly or the evaporator fan is not running at full speed.

To answer your question "Can an Ice-maker tube freeze?" Yes, they can and do freeze but when they do freeze that is caused by a defective inlet water valve that is leaking water by when it is supposed to be shut off. It can freeze if some one set the temp control to MAX cold. Additionally when they do freeze and the Ice-maker cycles the plastic hose on the back of the unit pops out of the ice maker tube and each cycle starts porting ice maker fill water on the floor.

This may sound odd.. but. Perform a manual defrost by removing the freezer contents and directing a fan into the freezer compartment for just over 2 hours. (Makes a water mess so do not leave it unattended) The return the unit to normal service and after 8 hours start watching the amount of ice produced. (Should be normal for 2 days!) If after 2 days the ice production slows again you have an automatic defrosting problem that is causing the ice build up on the evaporator coils.

If you need any more assistance please include your complete model number in any future responses.

Thanks for choosing FixYa,
Kelly
0helpful
1answer

Outer unit produce ice after tempreture 21

Hi, what you have is called a Heat-Pump, and it also has a reversing valve that reverses the flow of freon through the unit. In the winter time, the outdoor unit becomes the evaporator coil and the indoor becomes the condenser coil. You have what is called a defrost board and also defrost thermostats on the outdoor unit. When the unit starts to build up ice on it, it has a defrost timer and along with the stats will terminate a defrost and melt the ice away. You should see the fan shut down and the unit will start to throw off steam, almost looks like smoke. Ice is a normal thing to happen on heat-pumps as long as it goes through a defrost cycle every so many hours to keep the ice from getting real thick and the unit stops heating your home. So, if your not having heating problems, and the ice does not keep building and getting thicker and thicker, this is normal, and there is nothing for you to worry about. If you have any more questions, feel free to contact me and I will help you out. Please don't forget to rate this post for me, as I know you will be kind.
Sincerely,
Shastalaker7
A/C, Heating, & Refrigeration Contractor
0helpful
2answers

I just moved into this home and am wondering what EM heat is compared to just Heat and my outside unit is full of frost what do I need to do?

Hi, EM stands for emergency heat. You should only need to use it if the outdoor unit does not operate. You have what we call a heat-pump. If the outdoor coil is iced up, it should go into a defrost cycle to melt away the ice. You will know when it does as you will see steam coming up from the unit as though it is on fire. The outdoor fan will also shut down during this process. These units will defrost using time and temperature to defrost the coil. If the ice continues to build-up, and does not defrost every couple of hours, I would say you have a faulty defrost board or defrost thermostat. There is not alot you can do as these are very complicated systems to work on. You will more then likely have to call out a service tech to check this outdoor unit for you.It also should have heat strips in the outdoor unit for EM heat if the outdoor unit fails. If it is iced up it is on and running. Thats what I would do is keep an eye on it to see if it does defrost, and if not, you will need to get a tech out to check it. It takes special equipment to check these units. Please keep me posted.
Sincerely,
Shastalaker7
0helpful
1answer

Gets to 35-40 degrees then doesn`t maintain till is shut down and started over again.

This can be caused by the drain hole below freezer coil being blocked by ice. You MUST remove all ice in drain under freezer coil. Use turkey baster to squirt hot water into hole and use hairdryer to defrost. Possible defrost thermostat is defective. Unit never goes into defrost, ice forms on coil and in floor of freezer. After defrosting may work OK for a week or two but gradually gets warmer because ice is blocking ports where cool air gets to refrig. May also have water in refrig box. Can also be caused by defective defrost timer.
1helpful
1answer

Side by side refrigerator freezing up

inside the fridge there is a cold radiator which has filled with condensation or water from freezing it when say cleaned out the fridge this can be remedied by letting set for a few days outside in the sun so that water can evaporate properly or you can call a repair man and he can pull out frost radiator inside and defrost all the water out by dry wet vac and heater dryer

ice builds apon ice even a little bit can build up to a mountain same thing happended to my top end whirlpool i pulled the metal grate and defrosted this by pouring tap water over the ice which it went down the defrost tube outside water drain this helped greatly havent had trouble with ice since
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