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My lg split system model is LMS304V-4. the fan inside turns on for 3 minutes then turns off but the compressor does not cut in at all. the green light on the left of the panel inside blinks 5 times stops then blinks again.

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I could not find the model number listed in your inquiry, but a lot of LG minispits use the 5 blinking light for indication of poor communication between inside and outside units. Try this before replacing control boards. Power down the outside unit. Remove the cover for the control wiring and loosen and retighten the 4 wire going into the inside unit. Then go in and remove the shroud cover for the inside unit and find the other end of the control wires and loosen and retighten them. Sometimes over time corrosion builds up and causes loss of signal and the lack of proper signal during communication is similar to someone talking to you while you are listening to loud music while wearing a headset. You cannot hear what is being said because to much noise. Remove the cover on the outside unit and see if it has a white reset button. If it does have a reset button after you have performed steps above, try restoring power and pressing the reset button. If it does not have a reset button, it should automatically reset when power is turned back on. If these steps do not help you will probably have to replace the control board on the condensing unit.
Hope this helps.

Posted on Dec 11, 2014

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