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DonR1
Community Member
since ‎11-10-2021
‎01-04-2022

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nest thermostat error message e80

12-28-2021
why after working flawlessly for 3 years all of the sudden get the E80 error code?

Error Code E-80

11-10-2021
Nest keeps indicating Y-1 not connected. Checked everything form Thermostat to Unit. no issue that I can find. Removed nest and installed old manual thermostat and everything works fine. What's happening?