Navien NR-35D User Manual page 62

4. Select the Room Controller.
Searched only one Room Controller, it would be automatically
Connected. There will not be shown below screen.
If more than 2 room controllers are found,
please check the ID number of required room
controller on the screen, then select from APP.
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No room controller found, please
check AP mode of required room
controller is on, then try again.