I have an LG with an inverter function, bought it two years ago. This year I noticed it turns on for about 5 minutes, then shuts off, then turns back on again. It doesn't hold the temperature - the room stays at +28 even when I set it to +20. What could this be? Maybe it needs cleaning or a recharge?
Try cleaning the indoor unit and filters first - that's often the culprit, especially if you haven't cleaned it in two years. If that doesn't help, it's most likely a refrigerant leak or an electronics malfunction, and you'll need a technician for that. Inverter models usually have fewer issues, but it's still better to call a specialist for diagnostics than to keep guessing.
Most likely, you've got a clogged drain line in the indoor unit - people often miss this when cleaning, but it's usually what causes exactly these symptoms. When condensate doesn't drain properly, moisture builds up inside, ice forms on the heat exchanger, and the air conditioner's overheat protection kicks in - turns on and off repeatedly. Try clearing the drain: it's usually a tube running down from the bottom of the indoor unit. You can gently blow it out or flush it with a syringe full of water. Clean the filters too, of course, but the drain is often the main culprit.
After that, it's worth checking the seals - if they've dried out (and two years is definitely enough for that to happen), air will get sucked in, and the cooling power won't be enough to cool the room. If cleaning the drain and filters doesn't help, and the seals look fine, then yeah - most likely it's a refrigerant leak or an electronics issue. But before you call a technician, might as well check these simple things first 🤔
Before you call a technician, check if the temperature sensor on the indoor unit has gotten clogged up - it's usually hidden under a plastic cover near the evaporator. Even a thin layer of dust on the sensor can make the air conditioner think the temperature is already low enough, so it shuts off too early. Wipe it with a soft damp cloth, and the problem is often solved in two minutes.
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