Mon–Sun 6am–6pm, 24/7 emergencies

020 8050 5913

Central heating repairs and fault finding

When the boiler is firing but the house is still cold, the fault is usually elsewhere in the system: a stuck pump, a failed motorised valve, a blocked radiator or a thermostat that has stopped talking to the boiler. We find it and fix it.

Call Lee 020 8050 5913 Get a quote

24/7 emergency call-out, 365 days a year

Heating engineer working on a boiler and expansion vessel

When to call us

  • Radiators cold at the bottom or in some rooms only
  • Heating will not switch off, or will not come on
  • Hot water works but the heating does not, or the reverse
  • Kettling, banging or gurgling in the pipes
  • You have to top up the boiler pressure regularly

What’s included

  • Full system fault diagnosis
  • Pump, motorised valve and diverter valve replacement
  • Radiator valve and TRV replacement
  • Draining down and refilling the system
  • Bleeding and balancing radiators

Advice before an engineer

Several of our reviewers say Lee sorted their heating over the phone or on FaceTime, for example by resetting the controls or topping up the pressure, without needing a visit. Call first; it might be a five-minute fix.

Engineer fitting a radiator valve

Photographs from Green PHS jobs.

“Lee and Mark were excellent, really helpful, efficient and tidy. Great communication from start to finish. We felt they went above and beyond to make sure that we got a really good new system in our house. I would definitely recommend them.”

Brandon Hakim, Google review

4.8

from 201 Google reviews

Read more reviews

What central heating repair costs

£120 per hour inc. VAT
Weekdays 8am – 5pm (£100 + VAT)
£180 per hour inc. VAT
Out of hours, weekends (£150 + VAT)

Weekday rate applies Monday to Friday, 8am to 5pm. Out-of-hours rate applies at all other times.

1 hour: £120 including VAT (£100 + VAT), labour only.

  • Materials we supply are charged at cost plus 20%, plus VAT.
  • Billed by the full hour once we are more than 10 minutes into the next one.
  • Inspections, on-site advice and fault finding are charged at the hourly rate. Advice by phone is free.

Full prices and billing terms

Radiators, underfloor heating, cylinders, power flushing and smart controls.

Guides and advice

Central heating repair near you

We cover South and South West London and north Surrey. Choose your area for local details.

Central heating repair: common questions

Why is my radiator cold at the bottom?

Usually sludge has settled in it. A power flush or removing and flushing the radiator clears it.

Why is my radiator cold at the top?

Air is trapped in it. Bleed it with a radiator key, then check the boiler pressure is still around 1–1.5 bar.

Ask about central heating repair

We reply the same working day. For an emergency, call 020 8050 5913 instead.

So we can check we cover your area.

Boiler make, what it is doing, any fault code, and when suits you.

We only use your details to reply about this job. See our privacy notice.

Call Lee. He picks up.

Tell him what is happening. If it is a quick fix, he will talk you through it for free. If not, we will get an engineer to you, usually the same day.

020 8050 5913 Request a quote
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