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One Radiator's Cold At The Top, Another's Cold All Over. That's Not The Same Fault Twice.
A boiler that's firing fine but a house that still isn't heating properly usually means the fault's somewhere in the system, not the boiler itself: a pump, a valve, trapped air, or years of sludge nobody's dealt with.
Cold at the top of a radiator with warmth lower down is almost always trapped air, a five-minute bleed. Cold right across a radiator while its neighbours are fine points somewhere else entirely: a stuck TRV, a closed lockshield valve, or sludge sitting exactly where that radiator's flow enters.
Getting that wrong costs you twice: once for a bleed that never fixes it, and again when the real fault gets found a fortnight later. Working out which one you've actually got, before touching anything, is most of the job.
What Happens When You Call
Work out where the fault actually sits
Boiler, pump, a specific valve, or the pipework, checked in that order rather than assumed from the symptom alone.
Fix it, or flag the bigger job
Straightforward faults get sorted on the visit. If the real cause is years of sludge across the whole system, that's flagged honestly rather than patched with a fix that won't hold.
Balanced and tested before Sam leaves
A system that's been touched gets checked room to room afterward, not just at the radiator that was the original complaint.
Real Reviews For This Job
“Sam came over to carry out a boiler service and to solve the mystery of our radiators not getting up to temperature. Friendly, professional and very good at explaining what he was doing, and the heating is working perfectly now. Definitely recommend him!”
“I have been using his service for years, he has always been very professional and has explained everything very well. Even when the boiler had some issues he was quick to respond and come to fix it.”
Checkatrade member since March 2015, backed by their £1,000 guarantee.
Central Heating Repairs: The Questions People Ask
Why is only one radiator cold when the rest are fine?+
Usually a closed or stuck valve on that specific radiator, or sludge sitting right at its inlet. Worth checking before assuming it's a boiler fault, since the boiler's often working exactly as it should.
Should I bleed the radiators myself before calling?+
If you know how and it's just the top of one radiator that's cold, it's a fair first step. If it happens repeatedly or across several radiators, that's worth a proper look rather than bleeding the same one every few weeks.
Is a noisy pump something to worry about?+
Often it's a sign of air in the system or the start of bearing wear, and it's cheaper to deal with as a repair now than a full replacement once it fails outright.
How's this different from a power flush?+
A repair fixes a specific fault: a valve, a pump, a leak. A power flush clears sludge across the whole system. Sometimes a system needs both, and that gets explained honestly rather than upsold.