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gcampbell
Community Member
since ‎04-21-2023
‎06-03-2023

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  • 3 Posts
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e74 error Nest Learning Thermostat Gen3

05-19-2023
My Gen3 Nest Learning Thermostat always give an e74 error, saying there's no power to the Rh wire. The previous Honeywell thermostat (wiring photo attached) has wires to Y, G, C, O/B, and R and works just fine.I turned off power and connected to the ...

e74 error on Nest Learning Thermostat Gen3

04-21-2023
I'm trying to install a Gen3 Nest Learning thermostat to control my GrandAire heat pump/AC. The previous thermostat was a Honeywell Home ProSeries thermostat and it controls the AC perfectly. When I change to the Nest, it says there's no power to the...