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Raedler6
Community Member
since ‎01-16-2024
‎01-23-2024

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Error 74 on nest gen 3 with my heat pump

01-16-2024
I was changing my Nest out and when I rewired it I get an error e74. I have a heat pump and six wires. Yellow in Y, Green in G, W in W2/aux, red wire is in Rh and blue in C. What am I doing wrong?