How to read Trane and American Standard serial numbers

This covers Trane, American Standard. The serial number is on the metal tag on the outside of the unit. On an outdoor unit, look at the top right of the back. On a furnace, look at a side panel.

Brand on the labelSerial number

Reading it yourself

Since 2010: ten characters that start with four digits. The first two are the year and the next two are the week.
Example: 17103N6MF4 was made in week 10 of 2017.
2002 to 2009: nine characters that start with a digit. The first digit is the last digit of the year and the next two are the week.
Example: 7165RHAIG was made in week 16 of 2007.
1983 to 2001: nine characters that start with a letter for the year (W is 1983, B is 1987, Z is 2001). The next two digits are the week.
Example: B50632891 was made in week 50 of 1987.

This is the date the unit was made. It was usually installed soon after, but it can be later. If a serial doesn’t fit any of these patterns, look on the label for a printed manufacture date.

Sources

Checked in October 2026.

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