Electric shower won’t switch on at all (Triton & Mira)
⚠️ This needs a qualified professional
This fault involves gas or mains electrical work. Don't attempt a DIY repair — UK law requires gas work to be carried out by a Gas Safe registered engineer. Below is what to check and describe to them, not step-by-step repair instructions.
An electric shower with no response at all — no light, no water, no hum — is usually a power supply issue rather than a fault inside the unit itself, and worth ruling out before assuming the worst.
What’s safe to check yourself
- Check the shower’s dedicated pull-cord switch (usually mounted on the ceiling or wall outside the shower, separate from the unit’s own controls) is switched on — this is a very commonly overlooked cause.
- Check your consumer unit/fuse box for a tripped circuit breaker on the shower’s dedicated circuit — electric showers draw a lot of power and are always on their own circuit, so this won’t affect other rooms.
- Check the water supply isolation valve to the shower (if fitted, often near the unit or under a nearby sink) is open — some units won’t power on at all if they sense no water flow, depending on the model.
- If the circuit breaker has tripped and resets fine once but trips again as soon as the shower’s switched on, stop — that’s a sign of a genuine electrical fault in the unit, not something to keep resetting.
If the pull-cord switch and circuit breaker are both fine and the shower still won’t power on, or if the breaker keeps tripping when you try it, this needs a qualified electrician — do not open the shower unit casing yourself. Electric showers connect directly to the mains on a dedicated high-current circuit, and any fault here is a genuine shock risk.