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How do i tell how old a goodman heater is - Goodman GMS90703BXA Heater

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The key to telling how old a furnace is the serial number, it is encoded in the serial number as the week and year, so the first 2 numbers are the week of the year and the second 2 numbers are the year.
Example: ??3491?????
this would be the 34th week of 1991, there are other numbers in the serial number, but what you are looking for are 4 numbers in a row, first 2 numbers will not exceed the weeks in a year, and the second set of numbers will be the year.
I hope this helps, this number reading is usually true in most furnaces and air conditioners, there are exceptions, but it usually holds true.
If this has been helpful, please rate me and contact me if you have any furthure questions.
Paul Gibson

Posted on May 03, 2010

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