Goodman serial age
Manufacture date from the rating-plate serial. Same family as Janitrol. A printed MFR date on the plate still wins.
Goodman
Type the serial off the rating plate. Spaces and hyphens are ignored. Manufacture date is not the install date.
Diagnose this call
Age is open. The walkthrough is the seat.
Where the plate is
Indoor: rating plate on the blower-door vestibule. Outdoor: above the service valves or on the back panel.
Styles
1990s–present
1509123456
First two digits are the year, next two the month. 1509… = September 2015. Ten characters, all numeric, is the current US residential style.
PTAC / some Daikin-built
5FU5472618P
Letter month in position 2, letter year in position 3, often ending in P or D. Letter-year values are plant-specific — use the printed date or the Building Intelligence Center chart rather than guessing the letter.
Cross-checked against Goodman HVAC age. FieldBench does not host or republish that page. Letter charts we could not verify are linked out instead of invented.