HVAC Serial Number Lookup
Maytag Serial Number Lookup
Maytag is part of the Nortek / Nordyne family, alongside Broan, Frigidaire, Gibson, Intertherm, Kelvinator, Mammoth, Miller, NuTone, Philco, Tappan, Westinghouse. 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.
Decode schemes compiled from manufacturer literature and inspector references, cross-checked across two sources wherever possible (Maytag sources: building-center.org + howtolookatahouse; building-center.org only (single source)). Single-sourced rules are labeled low confidence instead of being presented as fact. A date stamped or printed on the data plate always outranks a serial decode.
Maytag Serial Number Formats
| Format | Era | Example | Confidence |
|---|---|---|---|
| 12 characters, typically 3 letters + 9 digits; characters 4-5 = year, 6-7 = month | ~1990s to present | GBB030708229 = July 2003 | high |
| Three groups; the middle group is a letter + 4 digits, week then year (Rheem convention, built by Rheem for Nordyne) | older Rheem-built units | MN3D102F38914228 = week 38 of 1991 | low |
Worked Example: Maytag GBB030708229
Expected decode: July 2003. Character by character:
GBB = plant/line prefix
03 = year 2003 (characters 4-5)
07 = July (characters 6-7)
08229 = week and sequence data
Maytag Refrigerant Timeline
| Manufacture year | Typical refrigerant | Notes |
|---|---|---|
| through 2009 | R-22 | Standard refrigerant of the era. Production of new R-22 ended in 2020; supply is reclaim-only. |
| 2010 to 2024 | R-410A | EPA banned R-22 in new equipment from January 1, 2010; R-410A was the standard through 2024. |
| 2025 and later | R-454B | Nortek chose R-454B for the 2025 A2L transition, including the Intertherm/Miller manufactured-housing lines. |
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.
Maytag Warranty Baseline
Varies by product line more than most brands. Unregistered baseline: 1-year parts / 5-year compressor. Registered within 60 days: 5-year parts on furnaces up to 10-year parts and compressor on packaged systems and heat pumps. Since October 2025 Miller products register under the Intertherm brand.
Source: intertherm.net + millerac.com warranty pages. Decode the manufacture date above, then confirm coverage through the manufacturer's own serial-number warranty lookup.
Frequently Asked Questions
How old is my Maytag unit?
Decode the serial number from the data plate. The dominant Maytag format (~1990s to present) is: 12 characters, typically 3 letters + 9 digits; characters 4-5 = year, 6-7 = month. Example: GBB030708229 decodes to July 2003. Subtract the decoded year from the current year for the age. Units past 15 years are replacement candidates, and past 20 a major repair rarely pays off.
Which brands share the Maytag serial number format?
Maytag is part of the Nortek / Nordyne family, alongside Broan, Frigidaire, Gibson, Intertherm, Kelvinator, Mammoth, Miller, NuTone, Philco, Tappan, and Westinghouse. These brands come off shared production lines with the same data plates, so one decode rule dates all of them, and the refrigerant and warranty picture is the same across the family.
What refrigerant does a Maytag 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.
Is my Maytag unit still under warranty?
Varies by product line more than most brands. Unregistered baseline: 1-year parts / 5-year compressor. Registered within 60 days: 5-year parts on furnaces up to 10-year parts and compressor on packaged systems and heat pumps. Since October 2025 Miller products register under the Intertherm brand. Decode the manufacture date above, then confirm coverage by running the full serial through the manufacturer's own warranty lookup. Terms shown are the current policy; older units often carried different terms.
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