One radiator cold while others heat in Granollers: causes and fix
Resumen rápido
Cold at top means air inside, bleed it.
¿Qué está pasando?
Air collects at the top and blocks water flow.
Causas más probables
Air at the top
altaAfter refilling the boiler.
Closed valve or lockshield
mediaThe small valve controls flow.
Sludge in the radiator
mediaCommon without a sludge filter.
Pasos de diagnóstico
- 1
Bleed the radiator
Loosen the bleed valve until water flows clean.
⚠ Parada de seguridad: After bleeding, top up the boiler. - 2
Open the lockshield fully
Open the small valve fully.
- 3
Compare with other radiators
If still alone cold, likely sludge.
Cuándo llamar a un profesional
Call if still cold or water comes out dark.
Coste orientativo en Granollers
55–280 €
Diagnosis and balancing.
Contexto local · Granollers
Hard water in Granollers accelerates sludge.
Granollers is the capital of Vallès Oriental and mixes a historic centre with recent residential estates. In the centre (Sant Esteve, Sant Miquel) we work on 1950s–70s buildings with tight inner courtyards and the usual condensation damp on flat roofs — we apply EPDM membranes and humidity-controlled vents. In Can Bassa and Can Mònic, well-finished new-builds drive demand for personalisation: bespoke furniture, fronts, shower screens. We coordinate often with local building managers. Excellent access via AP-7 and C-17.
- Comarca: Vallès Oriental
- Población: 62.475 hab.
- Parque de vivienda predominante: piso-moderno
- Año medio de construcción: 1976
- Códigos postales: 08400, 08401, 08402
Capital del Vallès Oriental, con centro denso y barrios residenciales en Can Bassa y Sant Miquel.
Preguntas frecuentes
Why refill the boiler after bleeding?
Pressure drops.
Is seasonal bleeding normal?
Yes, at the start of winter.
¿Prefieres que vayamos nosotros?
Diagnóstico y presupuesto en Granollers normalmente el mismo día.
Pedir presupuesto gratis