HVAC Serial Number Lookup
LG Serial Number Lookup
LG's serial format is read from a document published by the company that built the unit. Enter the serial from the data plate below to get the manufacture date with a character-by-character explanation, the unit's age, its refrigerant era, and the warranty picture.
Starting the decoder. The serial formats, the refrigerant timeline and the warranty terms further down this page are already loaded, so you can read yours off them now.
Every serial format on this page is read from a document published by the company that built the unit, held as a retained copy. The manufacturer's document "Outdoor Unit Drain Pan Heater", which prints this rule for the LG outdoor units it lists, not for indoor, portable or window units. A date stamped or printed on the data plate always outranks a serial decode.
LG Serial Number Formats
| Format | Era | Example | Confidence |
|---|---|---|---|
| First digit = last digit of the year (decade not encoded), digits 2-3 = month 01-12; where the first four digits also read as a two-digit year and month, the form LG's Multi V manuals print, that reading is shown as wellCross-checked across 2 secondary references, alongside a manufacturer document held. The manufacturer's document "Outdoor Unit Drain Pan Heater", which prints this rule for the LG outdoor units it lists, not for indoor, portable or window units. | ~2007 to present | 705KWPZ64912 = May of a year ending in 7 | medium |
Some older or conflicting LG formats are recognized but deliberately not decoded; the decoder explains why when it sees one instead of guessing.
Worked Example: LG 705KWPZ64912
Expected decode: May of a year ending in 7. Character by character:
7 = last digit of the year (decade not encoded): 2017 shown
05 = May (digits 2-3)
The one-digit year does not encode the decade; disambiguate via the refrigerant, the model generation, or the production date printed on the tag.
7 = last digit of the year (decade not encoded): 2007 shown
05 = May (digits 2-3)
More than one reading passes the validity checks for this serial, so all of them are shown, ranked, instead of a single guess.
LG Refrigerant Timeline
| Manufacture year | Typical refrigerant | Notes |
|---|---|---|
| through 2024 | R-410A | LG US residential and light-commercial systems ran R-410A through 2024. |
| 2025 and later | R-32 | LG chose R-32 for US split systems, VRF, and chillers from 2025. |
The refrigerant printed on the nameplate is authoritative; this timeline tells you what is typical for the age, not what is in a specific unit.
LG Warranty Terms
LG warranty lookup
No page of LG's own for looking up a warranty is linked here, and this page does not read any maker's records, so it cannot show whether a unit was registered.
Enter the serial in the lookup on this page for the build date and the unit's age. No LG warranty certificate is held here for a dated term, so the result dates no term, says so, and names what would answer it; a Service Brief carries what is known to whoever works on the unit.
What this tool holds on LG's warranty
This tool holds no LG warranty certificate; check the terms with LG for your model.
The result does not work out a dated term for LG: no LG certificate is registered for that here. Only the maker's records show whether a unit was registered.
Source: no LG warranty document held.
Frequently Asked Questions
How old is my LG unit?
Decode the serial number from the data plate. The dominant LG format (~2007 to present) is: First digit = last digit of the year (decade not encoded), digits 2-3 = month 01-12; where the first four digits also read as a two-digit year and month, the form LG's Multi V manuals print, that reading is shown as well. Example: 705KWPZ64912 decodes to May of a year ending in 7. Subtract the decoded year from the current year for the age.
Why can a LG serial number decode to more than one date?
The one-digit year does not encode the decade; disambiguate via the refrigerant, the model generation, or the production date printed on the tag.
Has the LG serial decode been checked against serials somebody else dated?
LG current: Checked against 7 serials whose date a recall notice published by someone other than us states (CPSC recall notice 17-055), portable (floor) air conditioners, models LP0711WNR/LP0813WNR/LP0814WNR. Every one was consistent with a reading this format produces, but on all 7 it was not the reading shown first. Where this serial admits more than one date, read them as a set. Also read against 1 serial where a public body's own equipment schedule prints a year beside the serial (Norcross, Georgia; the year sits under a column headed Year, which the document does not define), window unit: 1 matched the reading shown first.
What refrigerant does a LG unit use?
By manufacture year: through 2024: R-410A; 2025 and later: R-32. The refrigerant printed on the nameplate is authoritative; the year-based mapping tells you what is typical for the age, not what is in a specific unit.
How do I look up my LG warranty?
No page of LG's own for looking up a warranty is linked here, and this page does not read any maker's records, so it cannot show whether a unit was registered. Enter the serial in the lookup on this page for the build date and the unit's age. No LG warranty certificate is held here for a dated term, so the result dates no term, says so, and names what would answer it; a Service Brief carries what is known to whoever works on the unit.
Is my LG unit still under warranty?
This tool holds no LG warranty certificate; check the terms with LG for your model. The result does not work out a dated term for LG: no LG certificate is registered for that here. Only the maker's records show whether a unit was registered.
Why do some LG serial numbers refuse to decode?
This tool holds one source for the legacy LG format, and its position spec is internally inconsistent, so this tool does not decode it. Check the production date printed on the tag.
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