I coded this bit in Domoticz, so I know it works :-) And in fact the notifications was my primary reason for parsing the Fault log and publishing it to Domoticz. This addresses the biggest drawback in Evohome of notification during a fault condition. And even the main screen clears with no evidence of a Fault if the Fault has been restored by the time you see it.
The way you do it is to create a Notification rule on the Fault Log device.
See my screen shot that should give you a clue. I want to be notified on any non 0 condition. And I want to be notified via email. How you get notified is dependent on how you have configured Domoticz.