n261 error even after power connector installed, even though Nest works otherwise. Please help
Hi folks - I have a simple heating-only furnace setup in my house and after installing the new Nest thermostat was advised to install the power connector since I don't have a C wire.
I installed the connector and it is detected and the Nest operates fine (battery is charged; doesn't disconnect from wifi). Vin: 35V. But I keep seeing the N261 error. I have reset the breaker, restarted the Nest, but the error doesn't go away. Any ideas how to fix? Thank you
Posted Feb 11, 2026, 10:21 PM UTC
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