SerialAtlas
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HVAC date-code guide

Carrier serial number lookup

Carrier is a broad residential and light-commercial HVAC brand. Modern North American equipment commonly exposes the production week and year at the start of the serial number.

Parent
Carrier Global
Common code
Modern serials commonly begin with two digits for week and two digits for year (WWYY).
Reviewed
August 8, 2026

Instant equipment lookup

Decode the manufacturing date

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Equipment type

Using Modern serials commonly begin with two digits for week and two digits for year (WWYY).

Type exactly what is printed. Spaces and dashes are ignored.

Optional: add model number for capacity cluesAdd model

Model decoding is labeled as a clue unless the exact format is documented.

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EQUIPMENT DATA
MODEL24ABC636A003
SERIAL5019X30312
WeekYear

See exactly how the code was read

SerialAtlas highlights the date characters, names the matching rule, and shows alternative interpretations when the code is ambiguous.

  • Current age calculated automatically
  • Confidence and rule source shown
  • Optional model-capacity clue

Evidence-led route update

Carrier date-code evidence

If you need to estimate a Carrier unit’s manufacture age, start with the front two week characters and following two year characters in the common modern family.

Check modern WWYY before legacy Carrier year-month

Modern serials commonly begin with two digits for week and two digits for year (WWYY). The verified modern Carrier-family example uses WWYY. Carrier also has a separately encoded legacy year/month family, so the first plausible modern read is not universal across all eras. Carrier’s common modern family begins with week and year, while the catalog also preserves a legacy year/month family. The rating-plate era and full serial decide which existing rule is eligible.

Worked example: 5019X30312

5019X30312 — The verified decoder reads this fixture as Week 50 of 2019. The date is a manufacture estimate, not an installation date.

When Carrier model or tonnage is the real question

A serial date does not decode model capacity, efficiency, or configuration. Use the model-number and tonnage guide, then confirm specifications in Carrier literature or official support rather than inferring from a query fragment.

Model number vs. serial number

Use the Carrier model for product and nominal-tonnage context and the serial for age; send both for a parts or warranty conversation. Keep the model number with the serial when a model lookup, tonnage question, parts request, or warranty review follows.

Limits and official support

Older Carrier-family equipment can use a legacy year-and-month format. If the result affects warranty, registration, parts, safety, or replacement decisions, use the complete model and serial with the manufacturer or a qualified professional. SerialAtlas is an independent reference, not an official warranty lookup or warranty coverage decision.

Open Carrier support route

How to read a Carrier serial number

Modern serials commonly begin with two digits for week and two digits for year (WWYY). SerialAtlas removes spacing and punctuation, then applies only the documented rule families mapped to Carrier. The lookup remains in the browser.

Try this documented-style example5019X30312Load example

Equipment covered

  • air conditioners
  • heat pumps
  • furnaces
  • air handlers
  • packaged systems

Commercial, imported, very old, specialty, and private-label equipment can use a different code. Confirm the full rating plate before accepting a result.

Where to find the rating plate

  • Outdoor condenser or heat-pump cabinet, usually near the service valves
  • Inside the furnace or air-handler access panel
  • On the packaged-unit rating plate
  • Near the electrical disconnect or wiring diagram

Why more than one date can appear

Two-digit years and repeating letter cycles can point to more than one era. SerialAtlas ranks the plausible dates but keeps materially different alternatives visible. Label design, refrigerant, installation records, and product literature can resolve the era.

Source and verification

Inspector Handbook open reference data (CC BY 4.0). Independently implemented and reviewed August 8, 2026.

Open reference source

What this result does not prove

A manufacture date is not an installation date, warranty decision, recall match, condition assessment, or replacement recommendation. Confirm high-stakes decisions with the manufacturer or a qualified professional.