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Problem Guides

Showers

Pressure, temperature, leaks, screens and electric

13 free DIY guides · 47 total

Shower problems in UK homes range from weak pressure and scalding temperature swings to electric showers tripping the RCD and thermostatic cartridges that have seized solid with limescale. Electric showers, power showers, mixer showers, and digital showers all have different failure modes, and the fix for one type will not work on another. These guides cover all shower types and the most popular UK brands including Triton, Mira electric and thermostatic, Grohe Grohtherm, Hansgrohe Ecostat, Aqualisa, Bristan, and Stuart Turner, Salamander, Grundfos, and Aqualisa shower pumps.

Most popular
1

Thermostatic Cartridge Replacement (TMV Bar Valve)

Replacing a faulty thermostatic mixing valve (TMV) cartridge is the most common bar-valve shower repair. With the right cartridge and basic tools, it is achievable in under an hour and will restore accurate temperature control and prevent scalding.

2

Stuart Turner Shower Pump Not Working — Troubleshooting Guide

Monsoon or Showermate pump with no pressure, noise or tripping issues

3

Thermostatic shower valve — how to service and fix common faults

Stiff controls, no temperature adjustment, or dripping from the valve

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All guides
Airlock in Shower Pump — How to Bleed ItFree
Pump hums but only a trickle of water comes out — air is trapped· 15–30 min
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Aqualisa Shower Pump Not Working — Troubleshooting Guide
Aqualisa Aquastream or Turbostream pump with no pressure or flow issues· 30 min–2 hrs
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Bar Valve Shower Problems (Concealed & Exposed Bar Valves)
Bar valve showers — whether exposed chrome bar valves or concealed in-wall valves — are found in the majority of UK bathrooms with gravity or pressurised hot-water systems. Most problems come down to cartridge wear, check-valve failure, or filter blockage.· 45 minutes–2 hours
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Blocked or low-pressure shower headFree
Shower spray is weak or uneven· 15–30 min
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Blocked or slow shower drainFree
Water pooling in the shower tray — hair and soap build-up blocking the drain· 10–20 min
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Bristan Shower Problems (Bar Valves, Electric Showers)
Bristan is one of the most commonly installed shower and bar-valve brands in UK social housing and new-build properties. Parts are widely available and most faults are straightforward to fix — cartridges and solenoids are affordable and stocked at most plumbers' merchants.· 1–2 hours
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Digital Shower Not Working (Aqualisa HiQu, Mira Mode, Grohe Sense)
Digital showers use an electronic control unit (ECU) separate from the outlet, typically located in an airing cupboard or loft. Most faults are communication errors, power supply issues, or water temperature sensor failures — not the waterproofed outlet unit itself.· 30 minutes–half day
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Do I Need a Shower Pump? Signs Your Water Pressure Is Too LowFree
How to tell if a shower pump would fix your weak shower· 15 min
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Electric Shower Not Getting Hot Enough
An electric shower that runs cold or lukewarm is usually a wattage issue, a failing element, or a water pressure problem.· 30 min–2 hrs
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Electric Shower Tripping the Electrics
Electric shower causes RCD, RCBO, or fuse to trip when switched on or in use· 1–3 hrs (by electrician)
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Electric shower has stopped working
Electric shower — no water, no power, or trips the circuit breaker· 10–30 min
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Grohe Thermostatic Shower Problems (Grohtherm, Euphoria)
Grohe Grohtherm and Euphoria thermostatic showers are popular mid-to-high-end choices in UK bathrooms. Faults typically involve a seized thermostatic cartridge, failed check valves, or temperature calibration drift — most are DIY-fixable with a genuine Grohe cartridge.· 1–3 hours
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Grundfos Shower Pump Not Working — Troubleshooting Guide
Grundfos SB or CM pump with no pressure, noise or flow problems· 30 min–2 hrs
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Hansgrohe Shower Problems (Ecostat, Crometta)
Hansgrohe thermostatic showers — including the Ecostat and Crometta ranges — are premium German-engineered products. Faults are usually cartridge-related or caused by limescale in hard-water areas. Genuine parts are essential.· 1–3 hours
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How much does it cost to install a new shower in the UK?
UK prices for electric shower, mixer shower, and wet room installation — what affects the cost and typical price ranges.· 1–3 days
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Low water pressure in showerFree
Weak or trickling shower — causes and fixes for poor shower pressure· 15 min–2 hrs
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Mira Electric Shower Problems (Mira Sport, Mira Atom)
Mira is one of the UK's most trusted shower brands. The Mira Sport and Mira Atom are widely installed in new builds and renovations. Common faults include tripped thermal cut-outs, failed heating elements, and solenoid valve failures.· 1–3 hours
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Mira Thermostatic Mixer Shower Problems (Mira Select, Mira Advance)
The Mira Select and Mira Advance are bar-valve thermostatic mixer showers widely fitted in UK homes. Faults most often involve a worn thermostatic cartridge, a failed check valve, or a blocked filter. Both are DIY-serviceable with the right cartridge.· 1–2 hours
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Mixer shower going hot and cold — temperature not stable
Non-thermostatic shower changes temperature when other taps or WC are used· 1–3 hrs
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Mixer shower running too hot — cannot get cold water
Shower runs scalding even at coldest setting· 30–60 min
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No hot water from showerFree
Shower runs cold or lukewarm only· 20–60 min
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Positive Head vs Negative Head Shower Pump — Which Do You Need?Free
Not sure which type of shower pump you need? Here's how to tell· 15 min
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Power shower has stopped working
Mains-pressure power shower unit producing no water or no power· 30–60 min
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Replacing an Electric Shower — What to Expect
Electric shower has failed and needs replacing — costs, process, and what to check· 2–4 hrs (by electrician)
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Salamander Shower Pump Not Working — Troubleshooting Guide
CT Force or Right Pump with no pressure, noise, or keeps cutting out· 30 min–2 hrs
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Shower Head Low Pressure — Limescale Blockage FixFree
Reduced shower pressure from a previously good shower is almost always limescale blocking the nozzles.· 30 min
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Shower Leaking Behind the Wall — What to Do
A leak behind the shower wall is serious — it can cause structural damage and mould. Find and fix it before it gets worse.· 2 hrs–2 days
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Shower Pump Cutting Out or Stopping Mid-Shower
Pump starts then stops after a few minutes, or cuts out intermittently· 1–3 hrs
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Shower Pump Leaking Water — What to Do
Water dripping from the pump body, connections, or union fittings· 1–2 hrs
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Shower Pump Not Working — No Pressure or Flow
Pump is running but no water, or pump won't start at all· 30 min–2 hrs
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Shower Pump Tripping the RCD or Electrics
Pump causes the RCD or circuit breaker to trip when switched on or during use· 1–4 hrs
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Shower Pump Won't Switch Off — Keeps Running After Shower
Pump continues to run after the shower is turned off· 30 min–1 hr
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Shower door or enclosure leaking onto the bathroom floorFree
Water escaping around shower door seals, hinges, or frame· 30–60 min
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Shower head blocked with limescale — how to clean itFree
Shower spray pattern uneven or jets blocked by limescale· 15–30 min
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Shower pressure is lowFree
Shower is a weak dribble rather than a proper spray· 15–45 min
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Shower pump making loud noise
Pump hums, vibrates or rattles when shower is running· 30–60 min
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Shower temperature keeps changing hot and cold
Shower runs too hot or too cold randomly during use· 30 min
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Shower tray draining slowly or not at allFree
Water pooling in shower tray — slow or blocked shower drain· 15–30 min
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Shower tray leaking onto floor below
Water appearing on ceiling below bathroom after showering· 1–3 hrs
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Shower valve or mixer dripping when offFree
Shower head drips after you turn the shower off — worn cartridge or seal· 30–60 min
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Stuart Turner Shower Pump Not Working — Troubleshooting Guide
Monsoon or Showermate pump with no pressure, noise or tripping issues· 30 min–2 hrs
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Thermostatic Cartridge Replacement (TMV Bar Valve)
Replacing a faulty thermostatic mixing valve (TMV) cartridge is the most common bar-valve shower repair. With the right cartridge and basic tools, it is achievable in under an hour and will restore accurate temperature control and prevent scalding.· 45 minutes–1.5 hours
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Thermostatic shower not reaching temperature
Thermostatic bar valve or cartridge not delivering hot enough water· 30–90 min
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Thermostatic shower running too hot or too cold
Shower temperature is wrong or won't stabilise· 5 min
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Thermostatic shower valve — how to service and fix common faults
Stiff controls, no temperature adjustment, or dripping from the valve· 45–90 min
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Triton Electric Shower Problems (T80z, Seville, Amore)
Triton is the UK's best-selling electric shower brand. Most faults on the T80z, Seville, and Amore are caused by limescale, a failed solenoid valve, or a dead heating element — all of which can be diagnosed at home.· 1–3 hours
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Walk-In Shower Leaking Through Floor
Water escaping from a wet room or walk-in shower into the floor structure or room below· 1–5 days (repair)
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