Brand directory

Manufacturer-wide serial format

Only the U.S. 13-digit printed YYWW plus nine-digit SAP serial layout is covered. Enter all 13 digits without spaces; the nine-digit barcode alone has no date. Coverage begins in 2017, conservatively excluding the October2016 format transition. The result gives the manufacture year and the manufacturer's production-week number, not a calendar month or day. Weeks 1–53 are accepted for completed years; current-year week codes remain unsupported because the manufacturer's week-calendar boundaries have not been verified. Older, letter-prefixed, tankless OEM and international formats are not inferred. Unit identity, installation date, warranty and safety are not verified.

Printed page3 — Serial Number Change; YYWW date plus nine-digit numeric serial · Reviewed 2026-11-04; review due 2027-02-02.

Model documentation · Reviewed 2026-11-04; review due 2027-02-01.

Model documentation · Reviewed 2026-11-04; review due 2027-02-01.

Model documentation · Reviewed 2026-11-04; review due 2027-02-01.

Model documentation · Reviewed 2026-11-04; review due 2027-02-01.

Model-specific limits

Coverage is limited to the 10 exact base models reviewed in Bradford White's current U.S. Atmospheric Vent Gas family and a 10-character serial: two letters followed by eight digits. Other models, suffix variants, nine-character serials and the 2007 transition are not covered. Repeated year codes remain ambiguous when more than one documented year is possible; no date is returned then. Decoding does not verify unit identity, installation date, warranty, configuration or safety.

FAQ 12: Serial Number Date Code Reference; production year/month tables and sequence-length note · Reviewed 2026-11-03; review due 2027-02-01.

Model-specific limits

Coverage is limited to the nine exact current U.S. Power Vent Gas models listed with the 19 ending and a 10-character serial: two letters followed by eight digits. Decoding is conservatively restricted to 2022 onward; this is a service coverage boundary, not a manufacturer introduction date. Earlier unsuffixed models, extra suffixes and nine-character serials are not covered. Repeated year codes remain ambiguous when multiple documented years are possible. Decoding does not verify unit identity, installation date, warranty, configuration or safety.

FAQ 12: Serial Number Date Code Reference; production year/month tables and sequence-length note · Reviewed 2026-11-04; review due 2027-02-01.

Manufacturer-wide serial format

Manufacturer-format date interpretation for Bradford White Water Heaters matching exactly two letters followed by eight digits. A model number is optional; this rule does not verify a model, configuration, authenticity or physical unit identity. The documented eight-digit production sequence supports the conservative 2008 lower bound; nine-character serials and the 2007 transition remain unsupported. Repeated year candidates are retained; if more than one is possible, no date is returned. Installation date, warranty and safety are not determined. When an entered model has a reviewed model-specific rule, its restrictions take priority.

FAQ 12: Serial Number Date Code Reference; production year/month tables and sequence-length note · Reviewed 2026-11-04; review due 2027-02-01.

Manufacturer-wide serial format

Bryant-label residential R-22/Puron outdoor air conditioners and heat pumps only, using exactly WWYY, site E or X, then five numeric sequence digits. Initial service window is 2006–2025, a conservative boundary rather than a format introduction date. Other sites, lengths, refrigerants and layouts, furnaces, ductless, packaged/commercial, OEM/international and related brands are not inferred. Manufacturing week 01–53 is retained with year precision; no calendar month or day is calculated. Current-year and future codes stay unsupported. A date does not verify model identity, installation, warranty, condition or safety.

Printed page 3 — Unit Identification / Serial Number Nomenclature; 09/19 edition · Reviewed 2026-11-05; review due 2027-02-03.

Manufacturer-wide serial format

Bryant-label residential R-22/Puron outdoor air conditioners and heat pumps only, using exactly WWYY, site E or X, then five numeric sequence digits. Initial service window is 2006–2025, a conservative boundary rather than a format introduction date. Other sites, lengths, refrigerants and layouts, furnaces, ductless, packaged/commercial, OEM/international and related brands are not inferred. Manufacturing week 01–53 is retained with year precision; no calendar month or day is calculated. Current-year and future codes stay unsupported. A date does not verify model identity, installation, warranty, condition or safety.

Printed page 3 — Unit Identification / Serial Number Nomenclature; 09/19 edition · Reviewed 2026-11-05; review due 2027-02-03.

Manufacturer-wide serial format

Carrier-label residential R-22/Puron outdoor air conditioners and heat pumps only, using exactly WWYY, site E or X, then five numeric sequence digits. Initial service window is 2006–2025, a conservative boundary rather than a format introduction date. Other sites, lengths, refrigerants and layouts, furnaces, ductless, packaged/commercial, OEM/international and related brands are not inferred. Manufacturing week 01–53 is retained with year precision; no calendar month or day is calculated. Current-year and future codes stay unsupported. A date does not verify model identity, installation, warranty, condition or safety.

Printed page 2 — Unit Identification / Serial Number Nomenclature · Reviewed 2026-11-05; review due 2027-02-03.

Manufacturer-wide serial format

Carrier-label residential R-22/Puron outdoor air conditioners and heat pumps only, using exactly WWYY, site E or X, then five numeric sequence digits. Initial service window is 2006–2025, a conservative boundary rather than a format introduction date. Other sites, lengths, refrigerants and layouts, furnaces, ductless, packaged/commercial, OEM/international and related brands are not inferred. Manufacturing week 01–53 is retained with year precision; no calendar month or day is calculated. Current-year and future codes stay unsupported. A date does not verify model identity, installation, warranty, condition or safety.

Printed page 2 — Unit Identification / Serial Number Nomenclature · Reviewed 2026-11-05; review due 2027-02-03.

Manufacturer-wide serial format

Only the documented U.S. Daikin unitary ten-digit numeric YYMM system is covered within the conservative 2013–2026 service window. This is not a format-introduction date or global Daikin coverage. Ductless/mini-split, VRV, chillers/applied products, OEM, controls/accessories, international, letter-led and other layouts are excluded. Use the main unit’s serial, not a component number. Older and future dates or invalid months return no date. A date does not verify model identity, installation, warranty, condition or safety.

Printed page 2 — When Does Warranty Coverage Begin? paragraph (3) · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented U.S. Daikin unitary ten-digit numeric YYMM system is covered within the conservative 2013–2026 service window. This is not a format-introduction date or global Daikin coverage. Ductless/mini-split, VRV, chillers/applied products, OEM, controls/accessories, international, letter-led and other layouts are excluded. Use the main unit’s serial, not a component number. Older and future dates or invalid months return no date. A date does not verify model identity, installation, warranty, condition or safety.

Printed page 2 — When Does Warranty Coverage Begin? paragraph (3) · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented U.S. Daikin unitary ten-digit numeric YYMM system is covered within the conservative 2013–2026 service window. This is not a format-introduction date or global Daikin coverage. Ductless/mini-split, VRV, chillers/applied products, OEM, controls/accessories, international, letter-led and other layouts are excluded. Use the main unit’s serial, not a component number. Older and future dates or invalid months return no date. A date does not verify model identity, installation, warranty, condition or safety.

Printed page 2 — When Does Warranty Coverage Begin? paragraph (3) · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Goodman ten-numeric-digit YYMM format is covered, within the conservative 2013–2026 service window. This window is not a manufacturer format-introduction date. Older years, letter-prefixed, OEM and nonmatching formats are unsupported. Future dates and invalid months return no date. No Amana, Daikin, Janitrol or water-heater brand inheritance is assumed. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Printed page 2 — When Does Warranty Coverage Begin? paragraph (3) · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Goodman ten-numeric-digit YYMM format is covered, within the conservative 2013–2026 service window. This window is not a manufacturer format-introduction date. Older years, letter-prefixed, OEM and nonmatching formats are unsupported. Future dates and invalid months return no date. No Amana, Daikin, Janitrol or water-heater brand inheritance is assumed. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Printed page 2 — When Does Warranty Coverage Begin? paragraph (3) · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Goodman ten-numeric-digit YYMM format is covered, within the conservative 2013–2026 service window. This window is not a manufacturer format-introduction date. Older years, letter-prefixed, OEM and nonmatching formats are unsupported. Future dates and invalid months return no date. No Amana, Daikin, Janitrol or water-heater brand inheritance is assumed. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Printed page 2 — When Does Warranty Coverage Begin? paragraph (3) · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Lennox plant/year/month-letter layout with five or six numeric sequence digits is covered. Initial mapped years are 2019–2023 only; 2024 onward and earlier years remain unsupported in this batch. Month letters are A–H and J–M; I is not used. No characters, including O and 0, are silently substituted. Other layouts, OEM or international formats and related brands are not inferred. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Page 3 — Serial Numbering System; year/length table in parent manufacturer reference page 9 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Lennox plant/year/month-letter layout with five or six numeric sequence digits is covered. Initial mapped years are 2019–2023 only; 2024 onward and earlier years remain unsupported in this batch. Month letters are A–H and J–M; I is not used. No characters, including O and 0, are silently substituted. Other layouts, OEM or international formats and related brands are not inferred. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Page 3 — Serial Numbering System; year/length table in parent manufacturer reference page 9 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Lennox plant/year/month-letter layout with five or six numeric sequence digits is covered. Initial mapped years are 2019–2023 only; 2024 onward and earlier years remain unsupported in this batch. Month letters are A–H and J–M; I is not used. No characters, including O and 0, are silently substituted. Other layouts, OEM or international formats and related brands are not inferred. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Page 3 — Serial Numbering System; year/length table in parent manufacturer reference page 9 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Lennox plant/year/month-letter layout with five or six numeric sequence digits is covered. Initial mapped years are 2019–2023 only; 2024 onward and earlier years remain unsupported in this batch. Month letters are A–H and J–M; I is not used. No characters, including O and 0, are silently substituted. Other layouts, OEM or international formats and related brands are not inferred. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Page 3 — Serial Numbering System; year/length table in parent manufacturer reference page 9 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Lennox plant/year/month-letter layout with five or six numeric sequence digits is covered. Initial mapped years are 2019–2023 only; 2024 onward and earlier years remain unsupported in this batch. Month letters are A–H and J–M; I is not used. No characters, including O and 0, are silently substituted. Other layouts, OEM or international formats and related brands are not inferred. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Page 3 — Serial Numbering System; year/length table in parent manufacturer reference page 9 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the documented Lennox plant/year/month-letter layout with five or six numeric sequence digits is covered. Initial mapped years are 2019–2023 only; 2024 onward and earlier years remain unsupported in this batch. Month letters are A–H and J–M; I is not used. No characters, including O and 0, are silently substituted. Other layouts, OEM or international formats and related brands are not inferred. A date does not verify a model, capacity, installation date, warranty, condition or safety.

Page 3 — Serial Numbering System; year/length table in parent manufacturer reference page 9 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Only the illustrated 10-character Rheem month/year + one plant letter + five numeric sequence characters is covered (MMYYLNNNNN). Other leading-letter, all-numeric, GE, week/year, tankless OEM and HVAC formats are not inferred. Two-digit years retain both 1900s and 2000s candidates within the recorded1931–2099 water-heater era; future dates are excluded and multiple possible years return no date. The1931 lower bound comes from Rheem's official water-heater history, not a claimed introduction date for this serial layout. A serial-derived date does not verify a model, configuration, installation date, warranty or safety.

How to Find your Serial Number — 12 / 09 / D / 01234 layout table · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Ruud-label water heaters matching exactly plant letter A, M, Q or C plus nine numeric digits: plant, two manufacturing-week digits, two year digits and five sequence digits. Initial service window is 2013–2025; the 2012 migration year is conservatively excluded. W (Marathon/Eclipse), conversion suffixes, brand prefixes, month/year layouts, tankless/OEM, international and HVAC formats are not inferred. A manufacturer week 01–53 is retained with year precision and no calendar month/day. Current-year and future week codes return no date. No model identity, installation, warranty, condition or safety verification.

Page 2 of 2 — plant/week/year rating-label layout and plant identification table · Reviewed 2026-11-07; review due 2027-02-05.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.

Manufacturer-wide serial format

Trane-label central heating/cooling units only. Initial service accepts nine-character letter-year 1980–2001, nine-character numeric-year 2002–2008, and ten-character numeric-year 2010–2029 with documented character restrictions; 2009 transition is excluded. Future and current-year fiscal-week codes return no date. Fiscal weeks 01–53 are retained as manufacturer week numbers with year precision, never converted to a month/day. Accessories, standalone coils/compressors, ductless, OEM/international/other layouts and related brands are not inferred. No model, installation, warranty, condition or safety verification.

PDF page 137, ACIN-3 — Equipment Date Identification, effective 1/1/26 · Reviewed 2026-11-04; review due 2027-02-02.