York serial number guide
Find the complete York model and serial number, then use the manufacturer verification route.
Use the full rating plate
York codes vary by factory and era. A four-character shortcut would risk returning the wrong age.
- Photograph the full model and serial number.
- Note the equipment type and installation address.
- Ask manufacturer support to verify the manufacture date.
No automatic date guessing
This page identifies what to collect and where to verify it. It will not manufacture a confident-looking result from an ambiguous code.
About this lookup
York has used multiple factory- and era-specific formats, so this page does not automatically assign a manufacture date.
What it supports
Guide only: copy the complete model and serial number from the rating plate for manufacturer verification.
If your serial does not match
Automatic decoding is unavailable until the factory and era can be identified reliably.
Where to find the serial number
Check the side or rear of the outdoor unit, inside the furnace door, or on the air-handler cabinet. Copy the complete serial number, not the model number.