I have Lennox Harmony iii System with Dampers (3) to heat and cool house. I recently installed Nest thermostats as well. Now I have no heat in the Master whereas never had a problem with that before. That damper was stuck. Could have been a coincidence as system is 15 years old. But technician seems to think entire damper system needs to be replaced along with Harmony iii board as he cant get any dampers to go on or off. Dampers 1 and 3 stay open all the time. Anyone aware of compatibility issues with the Nest? Have been doing some ready about compatibility and perhaps adding a C wire.
source https://hvac-talk.com/vbb/threads/2235642-Help-with-Lennox-Harmony-iii-System?goto=newpost
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