I have a Lennox Elite Series furnace, GHR2603-75-2. It was installed in 1998. The furnace would not turn on and I discovered that the furnace house breaker was off. I found out the control board went bad (Black scorch marks). So I ordered a new one 21D83M-843 White Rodgers
to replace the 50A62-120 Lennox Surelight board that was in there.
Well after hooking everything up to the new board, I'm getting zero power to the Cool, Heat, Fan, EAC, XFMR and Line terminals. The only one showing 120 Volts is the HUM terminal.
How I hooked up the wires to the new board:
ACB Cool (Old Board) to Cool(New Board)
ACB Heat (Old Board) to Heat(New Board)
ACB Low (Old Board) to Fan(New Board)
120 Vac Hot (Old Board) to Line (New Board)
120 Vac TX (Old Board) to XFMR (New Board)
3 White neutral wires to Neutral 120 VAC on new board.
The transformer has four wires: Yellow, Black, Blue, and White. Heres how its wired:
Blue wire to 3 amp circuit breaker
. 3 Amp circuit breaker to blue wire on the wire adapator that came with the new board.
Yellow wire to the yellow wire on the wire adapter that came with the new board.
Black wire to XFMR.
How the Door interlock switch is wired:
Black wire from switch to Burner exhaust fan.
Black wire from switch to Line.
I was thinking something is wrong with the way the switch is wired with the new board. It was wired like this before. Only difference being that on the old board the terminal was labeled 120 VAC hot.
Heres the manual for the new board
Mabye someone here can give me some insight, or tell me what I'm doing wrong.