[JasonACT]

Does your multimeter have a buzzer to tell you when the resistance is low enough to consider it basically a wire? I think it needs to be properly tested / re-connected - and the connection also wired to the LE80's pin 8.

I think I'm out of ideas otherwise. Other than to say, I think it's this board... So even if you get a dual zone replacement, you can use your LCD with the replacements smaller board (the one in the picture) and be safe that you will have the correct # of zones.