Ten characters: four digits, one letter and five digits, with a valid production week/year prefix.
Carrier serial number lookup
Enter your Carrier equipment's complete serial number to estimate its production week, year and age. This lookup supports four digits, a letter and five more digits.
Older units, imported equipment and factory-specific formats may use a different code.
Carrier serial formats and examples
Read the first two digits as the production week and the next two as the year. The letter identifies a manufacturing location; the final digits identify the unit. A week code cannot identify an exact day.
Does your serial match the supported format?
| Serial or label | What this tool supports | Your next step |
|---|---|---|
| Four digits, one letter, five digits: WWYYLNNNNN | Supported when the production week is 01 to 53 and the date is plausible. | Enter all ten characters from the equipment label. |
| Letter-first, all-numeric or another serial shape | No automatic date from this lookup. | Use the model and complete serial with Carrier support. Do not rearrange date positions. |
| Separate compressor, board or other component serial | Not the equipment's manufacture date. | Find the serial on the unit rating plate before using this tool. |
Worked date-code examples
These examples illustrate the format. They are not records for your equipment.
3112U12345Production week 31 of 2012
31 is the production week, 12 is the year. U and the final five digits do not change this date reading.
2419A00428Production week 24 of 2019
24 is the week and 19 is the year. Keep the two leading zeros in the unit sequence.
5419A00428No date: check the production week
54 is outside the supported 01 to 53 production-week range. No calendar date or age is returned.
0128A12345No automatic century choice
At the October 2026 reference check, 28 cannot establish a past year. The tool asks for the full manufacture year from records rather than selecting 1928.
How the full year is established
The serial gives two year digits, not a century. Ordinary supported results use a 2000s interpretation. A future reading returns no date: supply a full manufacture year only if the equipment label, manufacturer record or paperwork establishes it. Older or different serial styles still need their own reference.
A serial-format match is an estimate. It does not establish installation date, warranty coverage, equipment condition or remaining life.
If the number does not match
- Check the row marked Serial or S/N. The model number describes a product, rather than its manufacture date.
- Copy every character, including leading zeros. Spaces and dashes can stay; do not add or rearrange digits to make a match.
- Use the equipment rating plate, rather than the label on a replacement board or compressor. Ask a technician for a label photo if access requires removing a service panel.
- Keep the model and serial together and verify with Carrier.
Carrier age lookup questions
Which Carrier serial-number format does this support?
The supported shape is four digits, one letter and five digits. The first two digits give the production week and the next two give the year. Older, all-numeric and other factory-specific shapes need manufacturer verification.
Does the production week tell me an exact manufacture day?
No. Carrier documentation identifies a fiscal production week. This lookup displays that week and year and uses an approximate calendar week to estimate age. The factory calendar may differ, so do not treat a converted calendar date as an exact manufacture day.
Can I use the same rule on every Carrier-branded product?
No. Confirm the product and serial shape first. A control board, compressor or different equipment range can have its own code. The name on the equipment label and the complete model number help support identify the right reference.
Does the serial prove the installation date or warranty coverage?
No. The production date is different from installation. Keep your invoice and check the manufacturer's equipment record for installation and coverage details.
References and verification
Date-code references checked October 5 and 6, 2026; year-handling reviewed October 7. These documents explain particular formats; they do not confirm your unit's record.
- Carrier production-week example
The 50HC electrical supplement shows 3112U12345 and identifies a fiscal production week. This is an example of the code structure, not proof that all Carrier equipment shares it.