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Labman - Thanks, sometime you have to really spell it out for me. :-)

Success! I pulled out the red wire, powered up the unit and no blower cycling! At that point it seems to be either wiring or...

Based on all these responses, I am guessing it is probably the thermostat. I realized that when I powered up the 'good unit' it did not do anything (no blower fan, nothing) as I suppose it should.
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Thanks for your response, Eric!

That sounded like the culprit. I have two of these Bryant units in the attic, so I swapped the logic boards between them. After the swap, the units both behave the...

Hi -

I have a Bryant 373LAV/376CAV (not sure exactly which one) mounted horizontally in the attic that is <5 years old and has been functioning perfectly since installed, including for the first...