If your Genius Hub is powered off, or not functioning, here is how to manually override the boiler controller, in order to operate your boiler.
When the Genius Hub is powered off, or not communicating:
- Press the 'On' or 'Off' button as required
or 
- The light will turn green if the boiler is requested to run, and red if requested to stop
Manually override the boiler or zone valve with the 'Single Channel Receiver'