Triton Electric Shower Problems (T80z, Seville, Amore)
Check the steps below first — if you're not confident, get it fixed safely today.
Post a job — we'll find you an engineer →Always isolate the shower at the consumer unit and confirm with a non-contact voltage tester before removing the cover. Electric showers run on a dedicated 8.5–10.8 kW circuit — treat it with respect.
Triton electric showers are reliable workhorses in millions of UK homes, but when they fail, the culprit is almost always one of three things: limescale buildup, a faulty solenoid valve, or a dead heating element. The good news is that most of these faults can be diagnosed and fixed at home without calling an engineer — and replacement parts cost between £15 and £40. This guide walks you through identifying your exact model, checking the basics before you open the unit, and then systematically testing the heating element and solenoid to pinpoint the problem. We've also included a troubleshooting section for the thermal cut-out and known quirks of the Seville model. That said, if you're uncomfortable working with high-current electrics or the fault lies beyond the element and solenoid, it's absolutely worth calling a qualified electrician or contacting Triton directly — safety always comes first.
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Most likely cause & what to check
Identify your exact model — the model name and kW rating are printed on a label inside the cover. The T80z is the most common budget model and has been sold in multiple generations since the 1990s; parts for pre-2010 units can be hard to find. The Seville and Amore are later variants sharing many internals. Note the kW rating (7.5, 8.5, or 10.5 kW) before ordering any parts, as heating elements are not interchangeable between ratings.
Check the basics before opening the unit. Confirm the isolator switch (usually a ceiling pull-cord or double-pole wall switch) is on and the supply fuse or MCB has not tripped. Triton T80z units draw up to 45 A at 10.5 kW — if the MCB is undersized or ageing, nuisance tripping is common. Also check the cold-water supply pressure: the T80z requires a minimum 0.7 bar static pressure to open its solenoid, so a failed stopcock or closed service valve upstream can mimic an electrical fault.
If the shower runs cold or only warm, the heating element is the prime suspect. On the T80z, isolate the supply, remove the four screws holding the cover, and locate the cylindrical copper heater tank. Use a multimeter set to resistance across the element terminals — a healthy element reads 4–6 Ω for 8.5 kW. An open circuit (OL) means the element has failed. Replacement elements for the T80z (Triton part 83100090 or equivalent) are available from Screwfix, Toolstation, or direct from Triton Showers (tritonshowers.co.uk, 024 7637 2222) for around £25–£40. The element screws out anti-clockwise with a 41 mm element spanner — wrap the new one's thread with PTFE tape.
If the shower clicks on but no water flows, or water flow is very weak, the solenoid inlet valve has likely failed or is clogged with limescale. On the T80z and Seville, the solenoid is on the cold-water inlet at the base of the unit. Unscrew the inlet fitting (with water off at the mains), pull the solenoid coil off its valve body, and inspect the rubber diaphragm inside for tears or limescale deposits. Soak the valve body in Kilrock or white vinegar for 30 minutes. A replacement solenoid coil (Triton part 83200570 for most T80z variants) costs around £15 from Plumb Center or direct from Triton.
The thermal cut-out (TCO) trips when the unit overheats — usually caused by low flow through a blocked filter or limescale-coated element. Triton T80z units have a resettable TCO behind the cover (a small red or white button near the heater tank). Press it to reset, but do not just reset and ignore the root cause — check the inlet filter screen (behind the solenoid inlet) and clean it, and inspect the element for heavy scale. If the TCO trips repeatedly the element should be replaced. On the Amore, the TCO is not resettable and the unit must be returned to Triton for service under warranty if still within two years.
For the Triton Seville specifically, a known fault is the flow/temperature selector switch developing a poor contact, causing the unit to cut out at full power settings. This can sometimes be resolved by operating the switch through its full range several times to clean the contacts. If the unit is out of warranty, Triton sells replacement switch assemblies via their spares line. For any repair beyond element or solenoid replacement — such as a faulty PCB on the Amore — contact Triton Showers directly: tritonshowers.co.uk or call 024 7637 2222 (Mon–Fri). Warranty is typically two years from purchase.
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Frequently asked questions
Why is my Triton electric shower running cold?
A cold shower almost always means the heating element has failed or the water pressure is too low to trigger the solenoid valve. Start by checking that your cold-water supply pressure is at least 0.7 bar and that the inlet valve isn't blocked — if that checks out, use a multimeter to test the element's resistance (a reading of OL means it's dead and needs replacing).
How do I know if my electric shower's solenoid valve is broken?
If the shower clicks on when you turn it on but little or no water flows out, the solenoid is your suspect. Remove the inlet fitting with the water off, pull the solenoid coil away, and inspect the rubber diaphragm for tears or white limescale — a good soak in white vinegar often clears scale, but a torn diaphragm means the coil needs replacing.
What does it mean when my electric shower's thermal cut-out keeps tripping?
The thermal cut-out trips to protect the unit from overheating, usually because water flow is too low or the heating element is clogged with limescale. First, check and clean the inlet filter screen; if the unit keeps tripping after that, the element itself is likely scaled up and should be replaced.
Can I repair a Triton T80z myself, or do I need an engineer?
Replacing the heating element or solenoid valve is straightforward for a confident DIYer — just make sure to isolate the electricity at the consumer unit and confirm with a voltage tester before opening the cover. For anything more complex, such as a PCB fault or issues on warranty units, contact Triton directly or call a qualified electrician.
How much does a replacement heating element cost?
Triton heating elements typically cost between £25 and £40 from high-street stockists like Screwfix and Toolstation, or direct from Triton's spares line — the key is matching the kW rating of your model, as elements are not interchangeable.
Why do I need to know the kW rating before ordering parts?
Heating elements are model and wattage-specific — a 7.5 kW element will not work in an 8.5 kW or 10.5 kW shower. The kW rating is printed on the label inside the shower cover, so check it before you order anything to avoid wasting time and money.