How to read a Carrier serial number
Carrier’s service manuals print a “Serial Number Nomenclature” diagram with the example 01 06 E 00001. Its labels: “Week of Manufacture”, “Year of Manufacture”, “Manufacturing Site” and “Serial Number”. A newer Carrier manual repeats the layout with 01 18 E 00001.
| Characters | Means |
|---|---|
| 1st and 2nd | Week of manufacture (01 = the first week of the year) |
| 3rd and 4th | Year of manufacture (06 = 2006) |
| 5th (a letter) | Manufacturing site. Carrier lists E = Collierville, Tennessee, and X = Monterrey, Mexico |
| 6th to 10th | A sequence number |
Basis: official (Carrier service manuals, Catalog No. 24-25-2SM, 2008, and 24VNA6-25VNA4-1SM, 2020; Bryant service manual, 2000). That’s the whole Carrier serial number age rule. The checker above applies it and gives your Carrier AC age, heat pump age or furnace age in years.
A week, not a month
The code gives a week, so the checker shows the month that week falls in: week 1 is early January, week 32 early August. When a week runs across two months, the result says so. (The week-to-month step is our conversion; Carrier doesn’t publish one.)
Worked examples
| Serial (source) | Reads as |
|---|---|
| 01 06 E 00001 (Carrier manual, 2008) | Week 1 of 2006, about January 2006, plant E |
| 01 18 E 00001 (Carrier manual, 2020) | Week 1 of 2018, about January 2018, plant E |
| 3298… (Energy Trust of Oregon, Carrier) | Week 32 of 1998, about August 1998 |
| 3188… (Energy Trust of Oregon, Bryant) | Week 31 of 1988, about August 1988 |
Basis: official for the two Carrier examples, which are layout illustrations in Carrier’s manuals, not real units; utility program guide (Energy Trust of Oregon) for the two serial beginnings. We don’t show other full serial numbers, because none of these sources gives one.
Bryant and Payne
Bryant. Bryant’s Application Guide and Service Manual lists the same ten positions: “Positions 1 and 2—Week of Manufacture”, positions 3 and 4 the year, position 5 the manufacturing site, then the serial number. So a Bryant serial number lookup works the same way: choose Bryant in the checker above. Its plant examples are A = Indianapolis and E = Collierville. CPSC recall notices list Carrier and Bryant units together (see Recalls below).
Payne. Payne’s website says the brand “is now WeatherMaker® by Carrier.” We haven’t found a Carrier or Payne document that explains Payne serial numbers, so the checker doesn’t decode Payne yet. Look for a date printed on the rating plate, or ask a licensed HVAC technician.
Where the serial number is
| Unit | Where to look |
|---|---|
| Outdoor AC or heat pump | On the rating plate on the back of the unit, near the service valve connections (Carrier). Bryant: “above the service valve connections” |
| Furnace | On the rating plate inside the front door panel (Carrier and Bryant) |
| Air handler | Inside the front door panel (Carrier’s parts page) |
Basis: official (Carrier homeowner FAQ and parts page; Bryant warranty information page). The outdoor plate is on the outside of the cabinet; don’t open the electrical access panel to look for it. If you’d rather not remove a furnace panel, a licensed technician can read the plate during a service visit. More on plate locations: how old is my AC or furnace?
Serial number lookup vs warranty lookup
The serial gives the build date. For coverage, use Carrier’s official Warranty Lookup, which asks for the serial number; Bryant has its own on its warranty information page. Carrier’s FAQ says “Your warranty begins the day your product is installed,” so the coverage dates and the build date can differ.
Older codes we don’t decode
An Energy Trust of Oregon program guide describes earlier codes:
- Carrier, 1960s: the first digit was the year (3xxxxx = 1963).
- Carrier, 1970s: a month letter and a one-digit year (A1 = January 1971; no letter I).
- Bryant, 1964 to 1979: two week digits, then a year letter (R = 1964 through H = 1979).
Basis: utility program guide (Energy Trust of Oregon), which also notes that Carrier “has used several different codes at different plants.” The checker doesn’t read these. A two-digit year can’t show the century either, so readings from the 1980s and 1990s come with a note to check the plate, and the checker doesn’t date units more than 45 years old.
Some other brands’ serials also start with four digits and a letter but mean something else, so the checker applies this code only when you choose Carrier or Bryant.
How long a Carrier AC or furnace lasts
Carrier says air conditioner and furnace life expectancy “will vary greatly”, for reasons that include installation and maintenance. ENERGY STAR suggests considering a replacement when a heat pump or air conditioner is more than 10 years old, or a furnace more than 15. Published lifespan ranges by source are on our hub: how old is my AC or furnace?
Age alone doesn’t decide a repair. Hire a licensed HVAC technician for a diagnosis or a quote; don’t attempt gas, refrigerant or electrical work yourself.
Recalls
| Recall | What CPSC lists |
|---|---|
| 17-150 (May 2017) | Carrier Greenspeed heat pumps 25VNA024, 036, 048 and 060, and Bryant Evolution Extreme 280ANV024, 036, 048 and 060, sold June 2011 to August 2016. Remedy: a free replacement fuse board |
| 20-009 (Oct 2019) | Carrier and Bryant ductless heat pump outdoor units (six listed models), sold March 2015 to April 2019. Remedy: a free repair |
Basis: official (CPSC notices in the sources). Neither notice lists serial ranges: you identify the units by the model number on the rating plate. Search the CPSC recall list with your brand and model number, too. Our recall check covers appliances and water heaters only; it doesn’t check HVAC equipment yet.
Limitations
- The serial gives the week the unit was built, not the installation date.
- A split system has two serial numbers, indoor and outdoor, and they can differ. Check both. Our home systems age report puts both on one printable page.
- A date printed on the rating plate beats any decode.
Checked against the sources below on 15 October 2026.
