Google Nest Community

I installed a nest thermostat using the nest power adaptor, I only had two wires going to my stat. The system works just fine, should I be concerned with the error 261 code. I know this code is related to the missing C wire, that's why I used the ada...

I need to connect a Nest thermostat with a Taco ZVC406 control board. I have only two wires to the thermostat. I have the nest power adapter. Can you helpThanks