Google Nest Community

Added power connector to P4 on burnham furnace. No error messages. Nest working normally. Power connector detected. Removed lead from envirocom port that Burnham recommended and spliced into P4 as instructed. Now batteries drained every three weeks. ...

  Adding nest thermostat to a two wire newer Burnham boiler x-205. Thermostat wires are easy to identify at boiler. But they go into a fully loaded crimped wire connector attached to the circuit board. Also cannot identify where common is.