Radiators can develop several different faults: a leak at a valve or joint, cold patches that suggest trapped air or sludge, or a valve that has seized and will not turn. We repair radiators across Cheam and Sutton as part of our wider heating and plumbing work.
Because radiators are connected to your central heating system, a fault in one radiator can sometimes point to something happening more widely in the system, such as a build-up of sludge or debris, so an engineer will consider the system as a whole rather than just the radiator itself.
If a specific radiator is cold while the rest of the heating works, our leaking radiator and radiator not heating pages cover those situations in more detail.
Common radiator faults
- Leaks from valves, joints or the radiator body itself
- Cold spots caused by trapped air or sludge build-up
- Seized or stuck valves that will not turn
- Noisy radiators, including gurgling or banging
- A radiator that will not heat up at all
What an engineer checks
An engineer will check the valves and joints for signs of leaking, bleed the radiator to check for trapped air, and assess whether cold patches suggest sludge build-up that may need a power flush to resolve properly.
Bleeding a radiator
Releasing trapped air using a radiator key can resolve cold spots at the top of a radiator, though it will not fix sludge sitting lower down.
What you can safely check yourself
You can bleed a radiator yourself using a standard radiator key if you feel confident doing so, and check that both valves at either end of the radiator are fully open. If a radiator is leaking, placing a container underneath and, if safe to do so, turning off the nearest valve can limit the mess until an engineer arrives.
How charging works
Radiator repairs are charged by time at our standard hourly rate, plus parts such as valves or seals. Where sludge is suspected across the system, we can discuss a power flush and its cost separately. See /our-rates for current hourly rates.
