Toilet won't stop running: causes and fix in Cerdanyola del Vallès
Resumen rápido
If the cistern won't stop filling, it's almost always the flush valve or float. In Cerdanyola del Vallès limescale speeds up wear.
¿Qué está pasando?
When the cistern keeps running, water comes in faster than the float can shut off, or the flush seal lets water escape.
Causas más probables
Worn flush seal
altaThe rubber bell hardens and leaks.
Misaligned or broken float
mediaIt can stick or be punctured.
Limescale-clogged fill valve
mediaLimescale clogs the inlet filter.
Pasos de diagnóstico
- 1
Close the toilet stop valve
There is a small valve behind or under the toilet.
- 2
Lift the cistern lid and watch
If water rises and spills over the overflow it's the float.
- 3
Identify the model and buy the part
Take a photo of the mechanism.
Cuándo llamar a un profesional
Call a plumber if the cistern is wall-embedded or water leaks from under the toilet.
Coste orientativo en Cerdanyola del Vallès
45–110 €
Call-out, diagnosis and replacement part.
Contexto local · Cerdanyola del Vallès
In Cerdanyola del Vallès older buildings have exposed cisterns.
Cerdanyola del Vallès has a building mix shaped by its university-town role: 1970s–80s flats in Centre and Banús let frequently to lecturers and students, which drives high demand for quick repairs between tenants. In Cerdanyola Nord and Bellaterra semi-detached homes with shared pools dominate. The UAB campus and the technology park also generate small refurbs in shared flats and converted offices. AP-7/B-30 congestion pushes us to morning visits for local clients.
- Comarca: Vallès Occidental
- Población: 57.892 hab.
- Parque de vivienda predominante: mixto
- Año medio de construcción: 1985
- Códigos postales: 08290
Mezcla universitaria (UAB) con barrios residenciales en Bellaterra y bloques en Canaletes.
Preguntas frecuentes
How much water does it waste?
Between 100 and 400 litres a day.
Can I do it myself?
Yes for exposed cisterns.
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Diagnóstico y presupuesto en Cerdanyola del Vallès normalmente el mismo día.
Pedir presupuesto gratisProblemas relacionados en Cerdanyola del Vallès
Más sobre Plumbing: leaks, blockages and water
Sources and regulation
- CTE DB-HS 4 — Suministro de agua — Código Técnico de la Edificación