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Rgarraton
Community Member
since ‎05-09-2026
‎05-10-2026

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E448 Message

05-09-2026
We have a new 4th Gen Nest Learning Thermostat which continues to show E448 no power error message. I cannot figure for the life of me why. I am replacing a Honeywell ProSeries Thermostat with basic wiring Y, W, R, C and G.