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Air conditioner compressor keeps shutting down

I have a LG 1.5 tons Split A/C and have noticed that the compressor keeps shutting down when the temperature outside is above 40 celcius especially in the afternoon. For example, when i turn on the A/C and set the temp to 28 the A/C cools for about half hour then turns off without reaching the desired temp and then the compressor does not come back on for 30-45 mins. What is causing this is? is it a faulty compressor?? I have also got the capacitor replaced and it still did not solve the problem. I have another Haier 1 ton A/C and this works fine in the same conditions. Please help and thanks in advance.

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  • abhishek_ban May 19, 2009

    The fan is always running even when the compressor is off so it can be due that. How can i check the oil in the compressor??



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This is due to thermal overload,Which can be caused by low oil in the compressor,the fan has stopped running on the unit outside,Dirty coils,or just a worn out compressor.Although this is thermal overload,It has nothing to do with outside temperature,But rather the internal temperature of the compressor itself.

Posted on May 19, 2009

  • Randy Hough
    Randy Hough May 19, 2009

    The best way is to have the unit totally evacuated and vacuumed,Then have new oil added and recharged with refrigerant.Since the Thermal overload can be caused by low oil,a partially restricted line,A loose connection in the wiring on the compressor,or the fan not working or working in the wrong direction(When the fan is working correctly,Air should be blowing out the top of the outside unit when the A/C is in cooling mode).

    If you can supply the results from previous test done,Such as the refrigerant charge pressure and at what ambient temperature,Head pressure reading(Pressure on the high side),fan direction,Etc.....

    I would be able to provide a more detailed solution.



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