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Dkacz
Community Member
since ‎03-13-2022
‎03-20-2022

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  • 1 Posts
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We have a boiler system. There are two wires only: Rh and W. We have window AC units. This shouldn’t be hard but for some reason when we tried to upgrade our Old thermostat to the new Nest one we kept getting an E74 error code then that stopped and w...
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