Why can I see an exclamation mark icon on my Halo?

If an exclamation mark is visible on the screen of your Halo control it indicates that your boiler has a fault. When the exclamation mark is visible the right hand button will take you to a fault page with a description of the fault on your boiler and instructions of what you need to do.

If your boiler has a fault and you have the Halo Combi Wi-Fi, the exclamation mark fault icon will also show on your app screen and you can tap through to a fault page  with a description of the fault on your boiler and instructions of what you need to do.