How to Decode Lennox Serial Numbers
Step-by-step guide to decoding any Lennox HVAC serial number. Learn the Year-Week (YYWW) format, what each digit means, and get instant results with our free decoder tool.
Step 1: Locate the Lennox Label
Find the data plate on your Lennox unit. It's usually on the side panel (outdoor units) or inside the cabinet door (indoor units). The label contains both the model number and serial number.
Step 2: Identify the Serial Number Format
Lennox uses a Year-Week (YYWW) serial number format. Do not confuse the serial number with the model number -- the serial is unique to each unit, while the model identifies the product line.
Step 3: Enter in the Decoder
Type your Lennox model or serial number into HVAC Decoder Pro. Our decoder instantly parses Lennox's encoding format and extracts manufacturing date, capacity, refrigerant type, and SEER rating.
Step 4: Review Your Results
The decoder displays a complete profile: manufacturing date, tonnage, BTU capacity, refrigerant type with phase-out status, SEER rating, and a color-coded condition indicator (Green = Good, Yellow = Aging, Red = Replace Soon).
Lennox Serial Number Format Reference
Format
Year-Week (YYWW)
Example Serial
2314B67890
Lennox serial numbers encode the manufacturing date, production facility, and unit sequence number. Our decoder handles all known Lennox serial number formats automatically.
What Your Lennox Serial Number Reveals
| Pos. | Field | Value | Meaning |
|---|---|---|---|
| 1-2 | Year of manufacture | 23 | 2023 |
| 3-4 | Week of manufacture | 14 | Week 14 (April) |
| 5 | Plant identifier | B | Manufacturing facility B |
| 6-10 | Sequential number | 67890 | Production sequence #67890 |
FAQ
Where is the serial number on a Lennox unit?
On the metal data plate -- side/back panel for outdoor units, inside the cabinet door for indoor units.
How do I read a Lennox serial number?
Lennox uses Year-Week (YYWW) format. Example: "2314B67890". Our decoder parses it automatically.
How old is my Lennox HVAC unit?
Enter your serial number in our decoder -- the manufacturing date is encoded in the Year-Week (YYWW) format.