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Geoellis
Community Member
since ‎07-17-2022
‎07-24-2022

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Intermittent E74 error messages

07-17-2022
After 5+ years of working perfectly, my Nest Thermostat started intermittently showing an E74 (No power from Rh wire) error message. Accordingly the AC goes on and off likewise. Any guesses as to which is the problem- the thermostat or the AC???