When used, the letters designated month and year of manufacture. The next two (and less common) styles used letter formats in the first OR last 2 serial number places. The last 3 digits represent the manufacturing date. The common style was strictly a numeric serial number typically comprised of 9 digits. When GE® was manufacturing their own central heating and cooling systems, they utilized different numbering and letter formats over the years. This page is not intended and should not be used to determine the manufacture date of other GE® appliances such as window air conditioners, dehumidifiers, or other such appliances. Most "newer" systems (after mid '80s and should they happen to have a GE® nameplate) will utilize Trane style numbering systems. They sold this division to Trane in 1982. General Electric® is no longer manufacturing central heating and cooling systems. If the central heating or cooling system in question truly bears the name "General Electric®" (GE®) then it can be assumed as very old and has exceeded the estimated useful service life.
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