Guardian Serial Number Lookup

Decode the serial number from the data plate. The dominant Guardian format (October 2004 to present) is: Letter + digit + letter + digit + 6-digit sequence; the two digits read together are the year, the second letter is the month (A to N, skipping I and J). Example: W1G7123456 decodes to July 2017, Wichita KS plant. Subtract the decoded year from the current year for the age.

Guardian is part of the York / Johnson Controls family, alongside Coleman, Fraser-Johnston, Luxaire, and York. These brands come off shared production lines with the same data plates, so this page's serial number formats apply across the family. The refrigerant timeline above is stated for the whole family, not per brand. The warranty section above is this brand's own.

York/JCI modern (letter-digit-letter-digit): Read against 6 serials where a public body's own equipment schedule prints a year beside the serial (Myrtle Beach, South Carolina; Wayne Township, New Jersey; the year sits under a column headed Year on 4, and in a row labelled Year Manufactured on 2, 4 of which the document does not define): 5 matched the reading shown first, 1 did not match any reading (the published year ran earlier than this tool's reading); and 1 serial where a seller entered a year in the listing's own year field on a government surplus listing for the serial (government surplus auction listings), ZEO48H12B4A1AAA1A1 rooftop unit: 1 did not match any reading (the published year ran later than this tool's reading); a seller's year is shown here for the record and is not counted toward this format's check.

York/JCI legacy (4 letters + 6 digits): Checked against 2 serials whose date a recall notice published by someone other than us states (CPSC recall notice 00-003), Diamond 80 downflow mid-efficiency furnaces. The date this tool reads first was consistent with the published window on all 2. Also read against 7 serials where a public body's own equipment schedule prints a year beside the serial (Myrtle Beach, South Carolina; Wayne Township, New Jersey; the year sits under a column headed Year on 4, and in a row labelled Year Manufactured on 3, 4 of which the document does not define): 7 matched the reading shown first.

Across the Guardian formats on this page, 2 serials with a date published outside this tool produced no reading at all (Myrtle Beach, South Carolina; government surplus auction listings). A serial this tool reads nothing from is neither an agreement nor a disagreement, so it is counted in neither.

Where someone outside this tool wrote down a different year for a unit, that year is shown here rather than dropped. It is that publisher's record for the unit, and a schedule or a listing can carry a replacement, system or lot year rather than the build year. The MFG DATE on the unit's data plate is the build date.

By manufacture year: through 2005: R-22; 2006 to 2009: R-22 or R-410A; 2010 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 Guardian'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 Guardian 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.

York, Luxaire, Coleman and Fraser-Johnston split-system certificates held here, 2014 to 2026, print a 5-year base parts term and 10 years if registered within 90 days of installation, except three-phase models (1-year parts) and the models an edition excepts. Editions up to January 2025 start the term at registration, or at shipment when no registration is on record; from April 2025 (6647857-UUM-A-0425, printed 2025-04-02) it starts at installation and needs no registration. Manufactured-housing units have their own certificate with 1-year parts. The result does not work out a dated term for Guardian: no Guardian certificate is registered for that here. Only the maker's records show whether a unit was registered.

This serial has York's legacy four-letter layout, and every date that layout's letter cycle gives it falls before March 1995. York International's Form 10-K for fiscal 1996 states: "On March 1, 1995, the Company acquired all of the capital stock of Evcon Holdings, Inc." It also states: "Evcon sells residential systems under the "COLEMAN EVCON", "RED T", "GUARDIAN" and "AIRPRO" brands." This tool holds no Evcon serial document, and it reads a serial in York's own layout on a Guardian unit as one built under York, from March 1995 on. So no date is read from it here. Read the manufacture date off the data plate.

No maker document held here dates Guardian furnaces, so the tool does not call a date a Guardian furnace's age; it reads the serial by the same rule it uses for Guardian's other equipment.