I'm monitoring my mother's house, which has a 5 zone Evohome system installed. It's critical for her wellbeing that the heating system is reliable.

Tonight the temperatures reported by the app are just not getting up the set points and some are actually dropping.

The original installer was very inexperienced and I don't want him back so can anyone recommend a good engineer in that area who can look at the whole heating system for me sometime soon and determine what's going on with it?