rear unit suddenly not responding to commands from thermostat - no "fan only", heat or cool. front unit is working fine. checked breaker ok. bad 'stat? is there a board in the unit that could be bad? it's totally dead as if there's no power to it.
Thank you, SoakedKarma. I'm hoping for a simple fix like that.
Thanks, MountainAir 05. Downloaded the manual - I always like to "do it myself" if at all possible.