This question is for a professional only who is familiar with 32M88 board !!!!
The original Surefire board failed within 2 days in a brand new Lennox G41UF furnace and a serviceman replaced it with an OEM replacement board 32M88, which works perfectly since.
This board has a double dipswitch (SW1 & SW2) to adjust "Fan-Off" time (60/90/120/180 sec)
However, it looks like, the board was designed for two additional dipswitces just located below, because it has 4 holes drilled out, and on the rear side of the board, foil + resistors are connected to the "missing" switches.
Anybody has any idea, what would these two "missing" switches control ?
Cool off fan timer ?
second stage fan timer ?