Hi guys, These furnaces are kicking my A** lately. This is a Rudd. My cheat sheats tell me that the first 4 digits after the “F” in the middle of the serial # are the year and month of manuf. Well , there is no “F” in this serial #.:roll: Any help would be greatly appreciated. The home was built in 1980.
Rudd model - UGAC-125A
Serial# - CN3D103 M0480 0394