Question about LG LSC091PMA Split System Air Conditioner

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Had a Fujita Split System installed by a professional but it keeps on losing the refrigerated gas. He checked the lines for leaks with a gas detector but nothing showed up. We have re-gased it 3 times but the system keeps on losing the gas..any solutions?

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  • sk35 Jan 30, 2010

    Wouldnt the leak detector pick up the leak in the system as well? He also did vacumn out the lines on instillation.

  • sk35 Jan 30, 2010

    Hi, the unit is a Fujita KF-70GW (cooling only) and it was purchased new. I had it in garage for 2 years before i installed it though. The Outdoor unit is directly behind the Indoor unit at approx 2-3 metres away. It seems to work when we re-gas but next time when i use it it just blows out air and not refrigerated.

  • sk35 Jan 31, 2010

    Thanks for the advice, is there a way of checking if the compressor is the cause? Would a gas leak check detect leaks from the compressor? Also it is only a small bedroom and it was stored where the temp would not venture over say 40 at the most, Is it worth getting someone else in to check the compressor or should i save my time and buy another one?




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Looks like your problem has landed in the wrong category under LG aircons with an LG model name.

Are you able to post the model no. of your FUJITSU split system.

What is the approx distance between the outdoor unit and the indoor unit (pipe length).

Is this a second hand unit? If so, do you have confirmation that it was working in the previous place.

Posted on Jan 30, 2010

  • Sam Jan 31, 2010

    Sorry to hear that you are having this problem with a new unit. Unfortunately, being out of warranty may not be much help for you either.

    If it is running out of gas immediately after you turn it on then it is likely a faulty compressor (could be manufacturing defect or dried out seals during storage). Vacuum test that the installer did would only check for leaks in coils and tubes. But if compressor is not working correctly then you have no chance of recovering the refrigerant during cooling operation.

    However, if the unit starts cooling and after some time blows hot air then you need to find out whether the size of the unit is adequate for your room, ie, is the compressor getting overworked causing it to loose the refrigerant.

    I cannot find much information on the internet on your make and model of the aircon so cannot tell you much further. If you have the receipts etc you could approach the selling dealer with the problem and ask for replacement under warranty - if you can prove installation was done recently by a qualified technician. You also have to be careful not to break the storage specifications provided by manufacturers. In other words if you left the unit for 2 years in a location where temperatures were higher than recommended (eg in a shed with 50deg + temperature through summer) or too humid.

    Good luck.

  • Sam Jan 31, 2010

    If the compressor is the problem then it is not usually a leak but the inability of the hot refrigerant in gas form to cool down back into liquid so that it can be recirculated through the system. It is not a static test. The compressor has to run.

    The following website will give you some idea of how these systems operate. You need to scroll down and also click on links within.

    If the installer is not knowledgeable about these things then one option is to find a local aircon repair person (not installation company) and ask their advise. Even an auto aircon repairer might be able to help.

    At some stage you will need to check, depending on cost of repairing the existing unit, whether to buy a new unit (a more common brand) which might set you back about $600 for a small unit plus installation. At least the pipes are already there.

    good luck.


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Sometimes you have to do what I call "Overkill" to cure this problem..The leak detector should find it, unless it is in the unit itself. Typically, the leak will be at a connection. Many of the new systems come precharged, and the linesets are installed with fittings. You could vacuum the system then change the linesets to copper and sweat the joints, eliminating a fitting issue with the linesets. If that doesn't cure, then the leak is withing the system and possibly a warranty issue. Good Luck! I hope you find this to be very helpful!

Posted on Jan 30, 2010

  • Hal Hallman Jan 30, 2010

    The only need at this point to vacuum the system would be to capture the coolant until the linesets are changed and the fittings removed, the refridgerant would then be replaced and charged to the proper levels. This would eliminate leaks at the most obvious, and the most typical places, the fittings, also, if you happened to have a damaged lineset that a leak was coming from, it would cure that as well.



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