Question about Mitsubishi MSZ09UN Air Conditioner

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Split system getting cold at first then just not cooling the room

Hi the air appears to be cool at first but not enough to cool the room down. The repairmain replaced the flanges and regased today but that has not solved the problem. In fact made no difference. Previously the aircon cooled the room down nice we ran it on 25 deg cel. Now it is set at a max of 16 deg cel.

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Split Air Conditioners are not meant to run constantly. so check this first . you may have a faulty component i.e. compressor, condenser, evaporator, or evap fan. Depending on your technician you may have gotten ripped off. You need to find out if he checked the system for refrigerant (gas) leaks. A good way to tell if your ac is leaking is feel the low and high side copper pipe in between the inside and outside units.
the smaller pipe (high side) should be hot be carefull maybe touch it with an ice cube. The Large pipe should be cold but not iced over.
if there is ice on any component you should call a qualified tech. you probably have a leak. you should also clean your air filters which are right above the vents. I am a certified AC mechanic and i have seen this problem. in Iraq because of ambient temperatures being high the systems take alot of abuse and we dont fix them because repair costs exceed replacement costs alot of the time. good luck.

Posted on Nov 19, 2009

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1 Answer

Related to cooling


Sounds like you have poor insulation in that room or the unit is undersized for the room it is cooling. It should not get hot quickly is there is good insulation and is big enough to do the job. Since you do not mention the age of your home/room or the size of the room, I can't be more specific. The number of turns may or may not be an issue. Depends of which of the lines are taking all the turns. Are the lines insulated? If they are overly long this could take longer to cool down but not much else if the system in full of Freon. If you do not feel cold air coming out of the unit at all and the compressor is running then check the air filter. If it is the littlest bit dirty and the unit is undersized for the room then any restriction would make it even more ineffective.

Apr 20, 2014 | LG LSC121PMA Split System Air Conditioner

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Not cooling anywhere near what it claims.


Try to turn OFF the Music Mode Only.
Turning on Music Only Mode will disable voice and data calls..

Regards

Sep 07, 2008 | Soleus LX-140 Portable Air Conditioner

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Blows very cold air during dehumidify mode.


se this fact: God bless you
air conditioning system cools but does not dehumidify the room. The most common cause of inadequate dehumidification by an air conditioning system is the installation of a cooling unit which has too much capacity, or is "over-sized" for the space it is being used to cool. What happens is simple:

If an air conditioning compressor unit is oversized (too many BTUH of cooling capacity) what happens is it cools the room so quickly that the system does not move enough total volume of air across the cooling coil to remove much moisture before the room temperature has dropped to the A/C cut-off point.

In other words, an air conditioner needs to run longer, and move more total volume of air through itself to drop room humidity than it does to just cool the air. So "bigger" cooling capacity or higher BTU capacity for an air conditioning system is not necessarily better, and it can actually be a problem.

Sep 30, 2012 | Heating & Cooling

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I have a split system model ls-k2464hl the remote works but will not turn on the unit.The unit will force run but only in cold


It sound like a defective receiver pcb. Have this professionally checked. I take the time to help, so please rate me!

Jun 15, 2010 | LG LS-K2430HL Heat Cool Mini Split Air...

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Room air conditioner not cooling low enough


It may need cleaning, if it cools when you turn the thermostat down it does not need refrigerant, the unit may have a thermostat our of caliabration.

May 27, 2010 | Kenmore 71121 Air Conditioner

1 Answer

Cooling not cold


Hi, This is called a split system heat-pump. If it was cooling and stopped and cooled again and now stopped, you need to be sure the outdoor unit is working properly. You can only check certain things as they require special gauges and know how. Make sure the condenser fan is on and reach down where the 2 copper lines are when it is on. Grab hold of the large line which is the suction side and it should be cold enough to condensate. The smaller is the liquid line and should be warm in the cooling mode.If not, listen to see if you can hear the compressor running inside of it. Should hear a humming sound. You can carefully remove the control panel door and feel it to see, but BE CAREFUL! Don't get your hand in the fan blade. Do these checks and get back to me when you do and we can go from there.
Sincerely,
Shastalaker7

Jan 05, 2010 | Heating & Cooling

1 Answer

Our air conditoner is throwing out cold air but the room is very hot the fan is blowing out cold air too it is not cooling the room down.


sounds like it does not have enough BTUs
so many BTUs can cool somany cu-feet if sealed space
Like leaving the freezer door open too seal that room

Jul 31, 2009 | DeLonghi Pinguino PAC-290 Air Conditioner

1 Answer

Thank you. there are some other signs i don't know about.


The black triangle means AUTO, means the fan speed adjust by itself from high-mid-low speed depending in room temperature but the unit is cooling for this function the same COOL mode. Plasma is in the remote control but it never mention in the manual.
If the unit dont cool check your temperature setting and mode setting it should be in cool mode and temperature setting should be 18C. But if still don't cool check some error code like blinking light at the indoor panel check how many blink appears to get the correct error code.. If the light is blinking 3 times it means that the room air or coil sensor is defective.

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Apr 28, 2008 | LG LSC121PMA Split System Air Conditioner

1 Answer

Non-cooling


- Calibrate your electronic thermostat if it is accurate. If not then replacement is needed.
- Check the location of your electronic thermostat, it may be installed in the room where its too cold.

Feb 29, 2008 | Carrier 36KCARMS Air Conditioner

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