Radiator troubleshooting guides
Diagnose radiator problems including cold radiators, trapped air, balancing issues and heating circulation faults.
Common problems
Radiator not heating after bleeding
Advice Hub / Radiators Radiator not heating after bleeding Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary This guide explains common causes and safe checks related to radiator not heating after bleeding. Safety first If you smell gas or suspect CO, leave the property and call 0800 111 999.
Radiators warm but house still cold
Advice Hub / Radiators Radiators warm but house still cold Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary This guide explains common causes and safe checks related to radiators warm but house still cold. Safety first If you smell gas or suspect CO, leave the property and call 0800
Radiator balancing explained
Advice Hub / Radiators Radiator balancing explained Check time: 3–5 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary This guide explains common causes and safe checks related to radiator balancing explained. Safety first If you smell gas or suspect CO, leave the property and call 0800 111 999. Do not remove boiler
TRV valve faults explained
Advice Hub / Radiators TRV valve faults explained Check time: 3–5 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary This guide explains common causes and safe checks related to trv valve faults explained. Safety first If you smell gas or suspect CO, leave the property and call 0800 111 999. Do not
Radiator valve leaking
Advice Hub / Radiators Radiator valve leaking Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Medium risk Quick summary This guide explains common causes and safe checks related to radiator valve leaking. Safety first If you smell gas or suspect CO, leave the property and call 0800 111 999. Do not remove boiler
Radiator whistling or banging when heating is on: common causes
Advice Hub / Radiators Radiator whistling or banging when heating is on: common causes Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary Whistling is often excessive flow through a valve; banging can be expansion, trapped air, or flow issues. The timing tells you a lot. Safety first If you
Radiator cold at the bottom: sludge or circulation?
Advice Hub / Radiators Radiator cold at the bottom: sludge or circulation? Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary If a radiator is warm at the top but cold at the bottom, trapped air is less likely — think flow restriction or sludge. Safety first Radiators can burn
One radiator not heating: valves, air, or balancing
Advice Hub / Radiators One radiator not heating: valves, air, or balancing Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary If all other radiators heat normally, focus on this radiator’s valves, trapped air, and whether it’s being starved of flow. Safety first Radiators can be hot — protect hands
Heating upstairs but not downstairs: circulation and balancing checks
Advice Hub / Boilers & Heating Heating upstairs but not downstairs: circulation and balancing checks Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary If upstairs heats but downstairs doesn’t, it’s usually flow distribution or restriction — not a thermostat issue. Safety first Don’t force valves or attempt internal boiler
Radiator cold at the top: air vs circulation
Advice Hub / Radiators Radiator cold at the top: air vs circulation Check time: 5–10 minutes • Difficulty: Easy checks • Safety: Low risk Quick summary If a radiator is cold at the top but warmer lower down, trapped air is a common cause. If the bottom is cold instead, circulation or sludge is more