How to read Bard wall-mount and geothermal units serial numbers
This covers Bard. The serial number is on the serial plate. On a wall-mount unit it's on the outside of the cabinet. On an indoor unit it's on the front of the control panel.
Reading it yourself
Since June 1980: three digits, a letter, then more digits. The letter is the month. Bard skips E, G, I and O, so F is May, H is June and P is December. The two digits after the letter are the year.
Example:
123A91123454502was made in January 1991.
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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