HVAC Serial Number Lookup
Rheem Serial Number Lookup
Rheem is part of the Rheem family, alongside Ruud, Sure Comfort, WeatherKing. 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.
7 of the 41 decode rules rest on a single secondary reference. Where two agree, that is weaker evidence than it looks: secondary references copy one another, and agreement between two is not a manufacturer document being read. Some of the formats on this page are read from the manufacturer's own document; the others rest on secondary references, and each row below says which. A date stamped or printed on the data plate always outranks a serial decode.
Rheem furnace not heating?
Its stop checks come first, then what its light or code means, on furnace codes for Rheem. Type what the furnace shows and it opens there with the brand filled in.
Rheem Serial Number Formats
| Format | Era | Example | Confidence |
|---|---|---|---|
| Letter + 9 digits; digits 2-3 = week, digits 4-5 = year (this format encodes week + year, not a month)Cross-checked across 2 secondary references, alongside a manufacturer document held. | ~1990s to present | W291013412 = week 29 of 2010 (mid-July) | high |
| 4 digits + letter + 5 digits; digits 3-4 = year. Sources conflict on whether digits 1-2 are the week or the monthCross-checked across 2 secondary references, not a manufacturer document. One reference reads the leading pair as a week; the other reads it as a month, and both agree on the year. | older units; also seen on water heaters | 0902C11246 = 2002; week 9 or September depending on the reading | mediumThe example shown decodes low: this format has more than one documented reading and that serial fits both. |
| 13+ characters with a factory letter (F, M, G, W, or N) mid-serial; the four digits after it are week then yearCross-checked across 2 secondary references, alongside 2 manufacturer documents held. | package/commercial and older spaced formats | AB7E203M129703576 = week 12 of 1997 | medium |
| 9 digits; the last two are the year, the two before them the weekCross-checked across 2 secondary references, not a manufacturer document. | mid-1970s and earlier | 168252873 = week 28 of 1973 | medium |
Worked Example: Rheem W291013412
Expected decode: week 29 of 2010 (mid-July). Character by character:
W = line/plant letter
29 = week 29 (positions 2-3)
10 = year 2010 (positions 4-5)
13412 = production sequence
Rheem Refrigerant Timeline
| Manufacture year | Typical refrigerant | Notes |
|---|---|---|
| through 2009 | R-22 | Standard refrigerant of the era. EPA ended U.S. production and import of R-22 on January 1, 2020; an existing system can still be serviced with recycled, reclaimed or previously produced R-22. |
| 2010 to 2024 | R-410A | From January 1, 2010, EPA allowed new R-22 to be produced or imported only for use in equipment manufactured before that date; R-410A was the standard through 2024. |
| 2025 and later | R-454B | Rheem and Ruud residential moved to R-454B from January 2025. During the mid-2025 R-454B cylinder shortage Rheem temporarily raised factory pre-charge on 13.4/14.3 SEER2 units to cover 30-foot line sets. |
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.
Rheem Warranty Terms
Rheem warranty lookup
The maker's own page: Rheem's own warranty and registration page, at rheem.registermyunit.com. The page reads: "Verify Existing Warranty". This page reads no maker's records and cannot show whether a unit was registered. Open Rheem's own warranty and registration page
What this page works out is the next question. Enter the serial in the lookup on this page and the result works out the parts term the Rheem warranty certificates held here print for that build date, naming the edition and quoting its clause, or says plainly why it cannot and what would answer it. It asks only for answers that would change a line it shows, each naming the line it moves, and a Service Brief carries the result to whoever works on the unit.
2 U.S. Consumer Product Safety Commission recall notices this tool matches name Rheem equipment. Where the serial and model entered meet, or may meet, a notice's printed conditions, the result shows that notice first, with CPSC's own hazard and remedy, and compares each condition; where a notice lists models and none was entered, it asks for the model, unless something else entered or read from the serial rules the unit out of that notice. It never says a unit is or is not recalled, and it says nothing when nothing entered meets or may meet one.
The Rheem warranty terms held here
36 Rheem family air conditioner and heat pump warranty certificate editions covering Rheem are held here, from 92-26150-31-00 (listed 06/10/2008 in Rheem's index) to 92-26150-31-36 (footer barcode date 04-06-2020, day first). Every one prints a base parts term of 5 years for the series its five-year row lists; the series change between editions, and the other rows they print are not registered here. The registered term is 10 years if registered within 60 days (92-26150-31-04 to 92-26150-31-30), on the models an edition lists; 10 years if registered within 90 days (92-26150-31-31 to 92-26150-31-36), on the models an edition lists. How the term starts changed between editions: first at a fixed time after manufacture, whatever the install date; later at installation, or at a date counted from manufacture when installation cannot be shown. None pays for labour.
Enter the serial and the model number above: the result works out the base parts term only where every held edition from the one dated before the build onward lists the model's series and a held edition is dated after the build. The newest Rheem edition held here, 92-26150-31-36 (footer barcode date 04-06-2020, day first), gives its five-year row to these series: RA13, RA14, RA16, RP14, RP15, P16; a model matches when it, or the model without its own first letter, begins with one of them. It also lists (-)A17*****N on that row, which the result does not work out, because the same series letters sit on its ten-year row. For any other model, or where no held edition is dated after the build, it says so and names what would answer it. Only the maker's records show whether a unit was registered.
Source: the maker's own limited warranty certificates, each identified by the part number printed on it; the serial result names the edition every line comes from.
Frequently Asked Questions
How old is my Rheem unit?
Decode the serial number from the data plate. The dominant Rheem format (~1990s to present) is: Letter + 9 digits; digits 2-3 = week, digits 4-5 = year (this format encodes week + year, not a month). Example: W291013412 decodes to week 29 of 2010 (mid-July). Subtract the decoded year from the current year for the age.
Which brands share the Rheem serial number format?
Rheem is part of the Rheem family, alongside Ruud, Sure Comfort, and WeatherKing. 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.
Has the Rheem serial decode been checked against serials somebody else dated?
Rheem family letter + week-year: Read against 1 serial where a public body's own equipment schedule prints a year beside the serial (Winter Park, Florida; the year sits under a column headed Year, which the document does not define), air handling unit: 1 matched the reading shown first. This format was also read against 4 serials on water heaters (Winter Park, Florida): 4 matched the reading shown first. They are shown for the record and not counted toward this format's check, because the equipment is not a heating or cooling unit.
Rheem family digits-first 10-character: This format was also read against 3 serials on water heaters (Winter Park, Florida): 3 matched the reading shown first. They are shown for the record and not counted toward this format's check, because the equipment is not a heating or cooling unit.
Rheem family long serial (middle factory letter): Read against 3 serials where a public body's own equipment schedule prints a year beside the serial (Winter Park, Florida; Mobile, Alabama; the year sits under a column headed Year on 2, and under a column headed Year Manuf on 1, 2 of which the document does not define), 1 of them condensing unit, across 3 equipment types: 3 matched the reading shown first.
No serial with a date published outside this tool has produced a reading through the Rheem family 9-digit (date at the end) 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 Rheem formats on this page, 5 serials with a date published outside this tool produced no reading at all (Norcross, Georgia; Winter Park, Florida). A serial this tool reads nothing from is neither an agreement nor a disagreement, so it is counted in neither.
What refrigerant does a Rheem unit use?
By manufacture year: through 2009: R-22; 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.
How do I look up my Rheem warranty?
The maker's own page: Rheem's own warranty and registration page, at rheem.registermyunit.com. The page reads: "Verify Existing Warranty". This page reads no maker's records and cannot show whether a unit was registered. What this page works out is the next question. Enter the serial in the lookup on this page and the result works out the parts term the Rheem warranty certificates held here print for that build date, naming the edition and quoting its clause, or says plainly why it cannot and what would answer it. It asks only for answers that would change a line it shows, each naming the line it moves, and a Service Brief carries the result to whoever works on the unit. 2 U.S. Consumer Product Safety Commission recall notices this tool matches name Rheem equipment. Where the serial and model entered meet, or may meet, a notice's printed conditions, the result shows that notice first, with CPSC's own hazard and remedy, and compares each condition; where a notice lists models and none was entered, it asks for the model, unless something else entered or read from the serial rules the unit out of that notice. It never says a unit is or is not recalled, and it says nothing when nothing entered meets or may meet one.
Is my Rheem unit still under warranty?
36 Rheem family air conditioner and heat pump warranty certificate editions covering Rheem are held here, from 92-26150-31-00 (listed 06/10/2008 in Rheem's index) to 92-26150-31-36 (footer barcode date 04-06-2020, day first). Every one prints a base parts term of 5 years for the series its five-year row lists; the series change between editions, and the other rows they print are not registered here. The registered term is 10 years if registered within 60 days (92-26150-31-04 to 92-26150-31-30), on the models an edition lists; 10 years if registered within 90 days (92-26150-31-31 to 92-26150-31-36), on the models an edition lists. How the term starts changed between editions: first at a fixed time after manufacture, whatever the install date; later at installation, or at a date counted from manufacture when installation cannot be shown. None pays for labour. Enter the serial and the model number above: the result works out the base parts term only where every held edition from the one dated before the build onward lists the model's series and a held edition is dated after the build. The newest Rheem edition held here, 92-26150-31-36 (footer barcode date 04-06-2020, day first), gives its five-year row to these series: RA13, RA14, RA16, RP14, RP15, P16; a model matches when it, or the model without its own first letter, begins with one of them. It also lists (-)A17*****N on that row, which the result does not work out, because the same series letters sit on its ten-year row. For any other model, or where no held edition is dated after the build, it says so and names what would answer it. Only the maker's records show whether a unit was registered.
How old is my Rheem furnace?
Rheem's own furnace parts list prints a furnace serial that begins with the "TYPE OF GAS CONTROL USED ON UNIT" and carries the plant letter F (the "Downflow/Horizontal Furnace" list). Enter the furnace's serial above: the result gives the date and age and says which document covers it. It covers serials of this layout: a two-letter gas-control code (DG, DH, DC, DF, EH, EJ, EK or EL), five more characters, the plant letter F, then the week and the year. A Rheem serial of another layout is read as usual, and the result says the date is not called a furnace's age.
Related Tools
HVAC Serial Number Lookup (All Brands)
The full decoder: 50+ brands across every major manufacturer family, with ambiguous formats shown honestly.
Tonnage From Model Number
The serial tells you the age; the model number tells you the size. Decode BTU capacity and tons from the model.
A2L Refrigerant Charge Limit Calculator
Replacing an old unit with R-454B or R-32 equipment? Check the room-size charge limits per UL 60335-2-40.
Same family, same decode rules: Ruud serial number lookup, Sure Comfort serial number lookup, WeatherKing serial number lookup.
Different brand on the data plate?
The full lookup covers 50+ brands across every major manufacturer family, with the same honest handling of ambiguous and undocumented formats.