How to Read a Serial Number
Use this guide when you have a serial number and need to turn it into a manufacture date or estimated age. The decoder below handles the brand-specific logic, while the sections on this page explain the workflow and common label locations.
Use this guide when you have a serial number and need to turn it into a manufacture date or estimated age.
The decoder below handles the brand-specific logic, while the sections on this page explain the workflow and common label locations.
Enter the serial number exactly as shown on the product label.
Need a fallback path? Use Smart Lookup for model-only or damaged-label research.
How to Read Serial Numbers
Choose the product brand first, then enter the full serial number exactly as shown on the label without skipping letters or zeros.
Serial number age checks only work when the brand and full code are correct, because each manufacturer uses its own date layout.
Where to Find the Serial Number
Appliance labels are usually inside the door frame, cabinet, or product opening, while HVAC labels are typically on the exterior cabinet or service panel area.
If the plate is dirty or faded, take a photo and zoom in before entering the code.
Example Serial Number Breakdown
Example: `AZ123456` may decode from leading letters on one brand, while `312KWAB12345` may use early digits for year and month on another.
The correct reading depends on the brand, which is why manual guesswork often creates the wrong decade or month.
FAQ
Can I read any serial number the same way?
No. Serial formats are manufacturer-specific, so the brand must be identified before decoding.
Why does the decoder ask for the full serial number?
Missing letters, zeros, or suffix characters can change the date result.
What if I cannot identify the brand?
Use Smart Lookup first, then return to serial decoding once the product line is clearer.