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Radiators Not Heating Up in Orpington / Bromley | SKR Plumbing & Heating
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Radiators Not Heating Up in Orpington / Bromley? Start Here

This one’s frustrating because it feels like the boiler is “working”… but the heat isn’t making it into the rooms. I see it a lot in the BR5/BR6 stretch — Orpington semis, Petts Wood terraces, and the mixed stuff heading up toward Bromley South. The good news: a chunk of these are simple (valves, air, settings). The bad news: if you keep forcing it, you can turn a small issue into a bigger one.

Call 07706 889 614 When to stop DIY

If you’re trying to get the house warm before school runs and you’re near Orpington Station or coming off Sevenoaks Way (A21), just ring me and tell me what you’re seeing: “one radiator cold”, “all radiators cold”, or “only upstairs working”. You can call me straight from this page: 07706 889 614.

Do This Now (Safe Checks You Can Actually Do)

Quick note: do these with the system cool where possible. Don’t take boiler covers off. Don’t guess with gas components. If anything feels sketchy, stop and call.

  • 1) Check pressure first Low pressure can stop circulation. Most systems are happiest around 1.0–1.5 bar when cold. If you keep topping up and the boiler keeps losing pressure, that’s not a “quirk” — that’s a leak or a failing part letting by. If you want to avoid digging blind, use pressure keeps dropping after you bleed radiators.
  • 2) Are TRVs open and not stuck? This is the classic: radiator “on 5” but still cold. The valve pin can stick. Gently tap the pin area (not smash it) and see if it frees. If you’re not confident, don’t force it — I’ve turned up to jobs near St Mary Cray Road where someone snapped a head clean off and created a new problem.
  • 3) Bleed one radiator (properly) If the top is cold and the bottom warms slightly, it may be air. Use a key, rag underneath, and stop as soon as water runs clean. Then re-check pressure.
  • 4) Feel the two pipes into the radiator One hot / one cold often means the radiator isn’t flowing (valve, blockage, balancing, sludge). Both cold suggests the heat isn’t reaching that part of the system.
  • 5) Check thermostat + programmer (sounds obvious… but yeah) I’ve been called out in Bromley where the room stat was set low and someone was convinced the boiler had died. Stress does that. If the heating is scheduled off, the radiators won’t magically decide to disobey it.
🧊 Cold at top = air
🟤 Cold at bottom = sludge
🚪 One room cold = valve / balance
📉 Pressure dropping = leak clue
Call — I’ll triage it fast Common causes

If you’re standing there thinking “radiator not working” and you’ve already tried bleeding, call me on 07706 889 614. If you’re around The Glades / Bromley South and parking is a pain, tell me — it changes what kit I bring and how I plan the visit.

What’s Usually Causing It (In Plain English)

I’m not going to give you 40 causes. Here are the ones I actually see repeatedly in Orpington and Bromley homes.

Airlocks and trapped air

Radiator cold at the top, warm at the bottom is the giveaway. Bleeding helps — but if you’re constantly bleeding, ask why air is getting in.

Stuck TRV pins (super common)

Looks like a dead radiator. It’s not. It’s just not opening. This is why “radiator not working” gets searched so much — it feels dramatic, but it’s often a little valve doing a little tantrum.

Sludge / magnetite

Cold at the bottom, warm-ish at the top, or slow to heat. Older systems especially can build up debris in radiators and pipework. If you’re in an older pocket near Crofton Road or similar, it’s not rare to see it.

Circulation problems

If the boiler is firing but the heat isn’t moving around, the pump / controls / balancing can be involved. This is where DIY starts getting risky because people begin “opening everything” and the system ends up worse.

A tiny story (because this happens all the time)

I got a call from a customer not far from Nugent Shopping Park — “half the house is freezing”. They’d bled every radiator, topped up twice, and were ready to book a new boiler (seriously). It was one stuck TRV and an imbalance that showed up when the weather got colder. Sorted it, explained what it was, and the boiler lived to fight another day. The point is: when you’re cold, everything feels like a disaster. Sometimes it isn’t.

When to Stop DIY

If you’ve done the safe checks and you’re about to start “trying things” — pause. This is the line.

  • If you smell gas Leave the property and call the National Gas Emergency number: 0800 111 999.
  • If the boiler cover needs to come off Stop. That’s for a registered engineer.
  • If you keep topping up and pressure keeps dropping That pattern usually points to a leak or failing component. Start with pressure keeps dropping after you bleed radiators.

FAQ

Only one radiator is cold — does that mean a big system fault?
Not usually. One cold radiator is often a stuck TRV, a closed valve, or balancing. If multiple are cold across floors, then we start thinking circulation/controls.
Bleeding helped… but now the boiler pressure is low. What did I do?
You’ve released air, and that can reduce pressure. Top up once if you know how safely. If you top up and the pressure drops again soon, it’s time to investigate the cause — pressure keeps dropping after you bleed radiators.
My radiators don’t heat but the taps are hot — is that normal?
Yes — it’s common enough to have its own fault path. If you have hot water but the heating refuses to start, it’s often controls/diverter/circulation rather than total boiler failure.
Could this be linked to a leak notice letter?
It can be, especially if you’ve had repeat pressure drops. If Thames Water believe there’s a hidden leak on your pipe, follow the correct steps first and avoid digging blind.
Do I need a new boiler if radiators aren’t heating up?
Not automatically. Valve issues, sludge, circulation and controls can mimic “boiler failure”. We diagnose properly first — replacements only make sense when the numbers and condition actually justify it.
None of the radiators are working and there’s no hot water either — what now?
That’s a different urgency level. If the boiler itself has stopped working completely, use that total-failure page so you don’t waste time on radiator-only checks.
Call 07706 889 614 Total failure page

If you’re in Orpington or Bromley and you’ve got radiators not heating up, call 07706 889 614. If you’re near Bromley South or coming off the A232, mention it — it helps me plan access and timing properly.