Toilet won't stop running: causes and fix in Barcelona
Resumen rápido
If the cistern won't stop filling, it's almost always the flush valve or float. In Barcelona limescale speeds up wear.
Need help right now?
Call us or message on WhatsApp. Fixed quote within 24 h, no obligation.
¿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.
Want us to take a look? Fixed quote within 24 h.
Coste orientativo
45–110 €
Call-out, diagnosis and replacement part.
Contexto local
In Barcelona older buildings have exposed cisterns.
Preguntas frecuentes
How much water does it waste?
Between 100 and 400 litres a day.
Can I do it myself?
Yes for exposed cisterns.
Related problems
Rather have us come over?
Same-day diagnosis and quote across Barcelona.