A: First you will need to test if you have a leak in your system. If not you could have a faulty reed switch which is marked as part 7 on the diagram.
http://www.showerdoc.com/shower-spares/mira/MIRA-PARENT-97-Mira-Enduro
You will need a multi meter to do this.
If these are found to be ok then I would suspect a pcb fault.
Answered 98 days ago | Barrie