Mira [G] fault codewhat it means and how to fix it

Code G is a small fault with a specific and recognisable presentation. The Advance watches its own Start/Stop button, and if that input stays active for longer than it plausibly should the appliance concludes the button is stuck rather than that somebody is holding it down for several minutes. It then stops, because a control input it cannot trust is a control input it cannot use to stop the shower either. The commonest physical causes are unglamorous. The button is a mechanical switch on the front of an appliance in a wet room, pressed with a wet hand several times a day, and over years the membrane perishes, the plunger sticks on soap residue, or scale builds behind the fascia and holds it partly depressed.

There is a second and slightly odd cause that catches people out: something resting against the front of the shower. A loofah hung over the unit, a bottle balanced on top of it, or a towel draped across the front can hold the button in exactly as a finger would, and the appliance has no way to distinguish the two. That is worth ruling out before booking anything, because it costs nothing and it is a genuine cause.

Beyond that, Mira publish a single action — contact customer services — and the reason is that the button is mounted on the cover PCB. Getting to it means getting the front off a unit fed from a 40 amp circuit in a bathroom, and depending on what is found the repair is either a cleaned mechanism or a new board. That is also why this code and code H are related without being the same: the button lives on the board, but Mira report a stuck button and a failed board separately.