A Boiler Controller is not communicating

Problem

A Boiler Controller is not communicating with the Heat Genius Hub

Boiler controller issues are due to the fact that the Genius Hub cannot route messages to the Boiler Controller.

Check the following to determine the cause of the issue:

Is the boiler controller powered on?
The Boiler Controller is often wired into the same electrical circuit as the boiler. It may be the case that it is not however.
Check that power is available, by looking at the lights on the front.
A single channel controller will have a solid red or a solid green light on it (picture). A dual channel controller will have a solid amber light (picture).
If there are not lights at all, then power must be restored to the boiler controller. You can check the fused spur that feeds the boiler, and also check the
Has a Smart Plug been