LG serials do encode the date: the first digit is the last digit of the manufacture year and the next two digits are the month. A serial starting "407" means July of a year ending in 4, 2014 or 2024, and that decade question is settled by the unit's refrigerant, condition and model. Many recent units also carry a small sticker with the month and year printed plainly.
Find your LG's age in 4 steps
- Find the label. On a wall-mounted split, LG puts the label low on the right side of the indoor unit as you face it, and on the outdoor unit's panel below the LG logo. Photograph it, you'll want the model and serial for quotes anyway.
- Look for a plain-printed date first. Recent LG units often carry a secondary sticker with the manufacture date printed outright, like "05 2017". If it's there, you're done.
- Decode the serial. First character: last digit of the manufacture year. Second and third characters: the month, 01 to 12. So "407HAVN79423" reads as July of a year ending in 4. This is an industry decoding used by inspectors and technicians, LG doesn't publish it officially.
- Settle the decade. The serial doesn't say which decade, "4" could be 2014 or 2024. The tie-breakers: R22 refrigerant means pre-2010, R32 means recent. R410A is the weakest of the three, because it arrived in the early 2000s and is still fitted to some ducted systems today, so on its own it rules out the R22 era rather than pinning a year. Wifi control, the model's era and simple condition usually make it obvious.
The LG serial format, honestly labelled
The year-digit-plus-month scheme is consistently documented by independent building-inspection and technician resources for LG air conditioners, but LG itself doesn't publish it, so treat the result as a strong indication rather than a certificate. Note that LG TVs use a different letter-month scheme, don't apply a TV decoder to an aircon serial.
A much older LG format (long all-digit serials from units mostly out of service now) encoded the date differently and is rarely seen; if your serial doesn't fit the pattern above, fall back on the refrigerant clue and LG support.
What the age actually means
The working rules across every brand: under 8 years old with a minor fault, repair it. Over 10 years with a compressor or refrigerant-circuit fault, price a replacement before you approve the repair, the maths usually favours the swap once efficiency gains are counted.
If the sticker says the refrigerant is R22, stop counting: Australia banned imports of new R22 equipment from July 2010, so the unit is 15+ years old. R22 itself is nearly phased out (imports end entirely in 2030), which makes regassing expensive when it is possible at all. On the next major fault, replace rather than repair.
- LG Australia currently backs residential splits with a 5-year parts and labour warranty plus an extended compressor parts warranty, check the warranty card for your unit's exact terms, as compressor cover has varied over the years.
- The warranty applies to the original purchaser and isn't transferable, so a unit that came with the house is on borrowed warranty time regardless of age.
Old enough to think about replacing? See what a replacement actually costs, or get quotes from up to 3 licensed locals who can assess the unit in person.
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