Mitsubishi Electric Serial Number Lookup

Decode the serial number from the data plate. The dominant Mitsubishi Electric format (~2000s to present) is: 9 characters; first digit = last digit of the year (decade not encoded), second character = month (1-9 = Jan-Sep, X = Oct, Y = Nov, Z = Dec). Example: 89D00488D decodes to September of a year ending in 8 (2018 for an R-410A unit). Subtract the decoded year from the current year for the age.

The main Mitsubishi Electric rule carries medium confidence, so treat the result as an estimate to check against the data plate. The decade is not in the serial; candidates shown newest first. The refrigerant on the nameplate narrows it (R-410A from roughly 2008 on, R-454B from the A2L changeover EPA's 2025 rule brought in) but cannot choose between two readings that share a refrigerant; a manufacture date printed on the data plate, where there is one, settles it. Mitsubishi's own serial legends differ by product: some print a production season that starts in April, so a January to March unit carries the previous season's digit, and others print the calendar year. No Mitsubishi document this tool holds states which applies to this nine-character layout, so the calendar reading is shown.

Mitsubishi Electric 9-character: Read against 2 serials 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), mini split condenser: 1 matched the reading shown first, 1 matched a later reading.

No serial with a date published outside this tool has produced a reading through the Mitsubishi Electric 8-character works serial (W) format yet. That format is read from a document published by the company that built the unit.

No serial with a date published outside this tool has produced a reading through the Mitsubishi Electric 8-character ending in T format yet. No document from the company that built the unit is held for it, so the rule rests on the secondary references this tool records.

Across the Mitsubishi Electric formats on this page, 1 serial with a date published outside this tool produced no reading at all (Wayne Township, New Jersey). A serial this tool reads nothing from is neither an agreement nor a disagreement, so it is counted in neither.

By manufacture year: through 2007: R-22; 2008 to 2024: R-410A; 2025 and later: R-454B. 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.

No page of Mitsubishi Electric'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 Mitsubishi Electric 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.

Mitsubishi Electric warrants parts for five years and the compressor for seven. For systems purchased from April 1, 2015 to April 30, 2019, registering within 90 days of installation in a residential single-family home extends both, further with a Diamond Contractor install; the statement for systems purchased from July 1, 2009 to March 31, 2015 prints no registration term. A later statement (Rev-2.9.2026) is held, but its header limits it to products purchased from October 25, 2025 through February 8, 2026 and its body to products purchased on or after its February 9, 2026 effective date, so this tool does not read a term from it. The result does not work out a dated term for Mitsubishi Electric: no Mitsubishi Electric certificate is registered for that here. Only the maker's records show whether a unit was registered.