Worcester Bosch boiler repair and service engineers in London
No domestic boiler brand is fitted more widely in the UK, and it is the make we come across most in London homes.
- Fully insured and Gas Safe registered
- Every fault diagnosed before we quote
- You agree the price before we start
- Our workmanship is guaranteed
Monday – Sunday, 7:00 AM – 10:00 PM · Out-of-hours emergency? Call 020 3576 5825
Ask for a price on your Worcester Bosch
Name, phone and postcode are all we need to start. Everything else can wait.
Thank you — your enquiry is in
Expect a call back on the number you entered. For anything urgent, there is no need to wait: ring 020 3576 5825.
Worcester Bosch boilers
Few boiler brands are installed as widely in the UK as Worcester Bosch, and across London it is the make Ninja Plumbers engineers are called to more than any other. Its Greenstar boilers come as combi, system and heat-only models in most household sizes. With so many in use, the same small set of faults comes up time after time, so the usual repairs are well known.
The Worcester Bosch range
Worcester Bosch has been owned by the German Bosch group for decades, but the boilers are still designed and built in Worcester. The gas boilers sit under the Greenstar name: combis for most flats and smaller houses, system boilers for homes with a pressurised cylinder, and heat-only (regular) boilers for older systems with tanks in the loft. Current models carry series numbers such as 4000 and 8000. Older ones, still all over London, carry letters instead — Greenstar i Junior, Si and CDi among them. It sits at the upper end of the mainstream: not the cheapest boiler an installer can fit, but rarely a surprising choice. Worcester also makes oil boilers, which need an OFTEC-registered engineer rather than Gas Safe. Ninja Plumbers does not currently offer oil work, so this page covers the gas Greenstar range.
Faults we often find on Worcester Bosch boilers
- Hot water working but no heating, or heating but no hot water, from a diverter valve fault
- Older Greenstar boilers losing pressure and needing frequent top-ups
- Frozen outside condensate pipes locking the boiler out after a cold night
- Limescale on the hot water side making the temperature swing from hot to lukewarm
- Fault codes and cause codes on the display that identify the part that failed
This list reflects what Ninja Plumbers finds across Worcester Bosch boilers in general. It is not a diagnosis of yours, and we confirm any fault on site before giving a price.
Worcester Bosch servicing
A Worcester needs the same annual service as any gas boiler, and its manufacturer warranty usually depends on it: a yearly service by a Gas Safe registered engineer, recorded in the service record at the back of the manual. Check your warranty terms, because the length and conditions vary with the model and with who installed it. Alongside the combustion and flue checks, the engineer cleans the condensate trap and checks the expansion vessel. If a magnetic system filter is fitted under the boiler, it gets emptied too, and on an older London system it often holds a surprising amount of black sludge. Greenstar displays show a fault code and, on many models, a cause code beside it. If the boiler has been locking out between services, photograph the display before resetting it.
Repair it or replace it?
A Worcester under about ten years old is nearly always worth repairing. The faults that stop them — a diverter valve, a fan, a pump, an expansion vessel — are replaceable parts, not a reason to write off the boiler. The sums change when the expensive components go on an older unit. A new main control board or heat exchanger on a fifteen-year-old Greenstar is a lot to put into a boiler that has done most of its work, and we will say so. Two other things point towards replacement. A non-condensing Worcester, fitted before condensing boilers became the standard for new installations in England and Wales in 2005, uses noticeably more gas than a modern one. And a boiler that has needed three or four repairs over two winters is usually telling you something. The replacement need not be another Worcester: if the current one never kept up, a different size or type is worth discussing.
Work we do on Worcester Bosch boilers
-
Worcester Bosch boiler repair
We find the fault first, then quote for the fix.
-
Worcester Bosch boiler service
An annual check, which most manufacturer warranties require.
-
Worcester Bosch boiler installation
Matched to your home, at a price agreed up front.
-
Worcester Bosch boiler replacement
You see repair and replacement costs side by side first.
Questions about Worcester Bosch boilers
- Does an engineer need Worcester accreditation to work on one?
- No. Repairing, servicing and installing a Worcester Bosch boiler is legal for any Gas Safe registered engineer. Manufacturers do run accreditation schemes, and these can lengthen the warranty on offer, but the work does not require one, and we never claim an accreditation we do not hold.
- My Worcester shows a fault code. Is it OK to keep resetting it?
- Resetting once is fine. Before you do, look at the pressure gauge and make sure gas is reaching the hob. In freezing weather, check the white plastic condensate pipe where it comes out of the wall. If it locks out a second time, leave it. Each reset only runs it until the same fault trips it again, and a photo of the code helps us far more.
- Can you work on a Worcester oil boiler?
- No. Oil work needs an engineer registered with OFTEC, which is separate from Gas Safe, and Ninja Plumbers does not currently offer it. We would sooner tell you now than send an engineer who could not sign the work off.
- Can you repair and service my Worcester Bosch boiler?
- Yes. Our gas work is done by Gas Safe registered engineers, as the law requires for any gas boiler, whatever the make.
We handle every make of boiler
Problem with your Worcester Bosch?
Tell us the model and whatever fault code the display shows. We can often say what the likely problem is before an engineer is on the way.