date of furnace

[Gregg Austensen]

Can anyone out a date on the Rheem unit?

Model # 2403 120D
SN 212939 CO4

[David Banks]

Are you sure those are the serial numbers? The chart I have for Rheem it makes no sense.

[Gregg Austensen]

Dave I left of the last 3 digits should be SN 212939 CO4

[David Banks]

Chart I have says last four digits of serial number by week and year.
9th week of 2004. Does that make sense from your visual observation?

[Gregg Austensen]

No ,I would have expected it to be older given the amount of corrosion on the exchangers. Either way I'm recommending service by HVAC contractor because of the heavy rusting. Thanks!