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It won't do anything, not even a click. Board LED is constant red. Verified 120V into transformer, 24V out. It's only sending 16V to the thermostat (Red), and that 16V is coming back (white). Disconnected and shorted R->W, no change. Verified continuity on all switches. Reading 0V at inducer blower. I'm thinking bad board, since as far as I know, it should be 24V to and from the thermostat. Any other ideas out there?
 

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Check that heat exchanger for cracks or popped crimp rings before investing money to replace the board. GMPs are know for popping crimp rings.
 
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