07956 994429 020 8244 0912 INFO@DHPLUMBING.CO.UK GAS SAFE REGISTERED#180521 AboutServices Service Areas Our WorkReviewsContact 07956 994429020 8244 0912 Request EstimateQuote - Home - Services - Boiler Repairs Gas Safe #1805214.9★ · 159 Google reviews30+ years local # Boiler Repairs inWoolwich & Greenwich Rapid Diagnosis by a Gas Safe Engineer Cold radiators, no hot water, an F1, F22 or E133 lockout code, we've seen every fault on every major boiler over the last 30+ years. Fixed-price diagnostic, honest recommendation on repair versus replace, no upsell. Request a free estimate Call 07956 994429 Call 020 8244 0912 Prompt appointments available · £80 minimum labour 30+ yrs Local experience 180521 Gas Safe registered 4.9★ 159 Google reviews £5m Public liability insured 9–9 Office, 7 days a week Overview ## The right diagnosis, the first time Most boiler faults are one of about a dozen problems, but you have to know which dozen. Guessing costs you parts you don't need. What it isA boiler repair is a structured fault-find on your gas appliance: pressure, gas rate, flue integrity, sensor readings, error codes and component condition, followed by a repair or a written recommendation to replace if it isn't economical. Who it's forAny homeowner or landlord across SE London whose boiler is locking out, losing pressure, running noisily (kettling), producing lukewarm water, cutting out on hot water demand, or throwing an unfamiliar error code. When you need itImmediately if there's a smell of gas (call the National Gas Emergency Service on 0800 111 999 first). Otherwise as soon as you notice symptoms, a small fault ignored for a month typically doubles the repair cost. Why a professional mattersA Gas Safe engineer is the only person legally allowed to work on a gas appliance in the UK. Beyond compliance, a good engineer will read your combustion analyser figures and know from experience whether it's the diverter valve, the PCB, the fan or the flue sensor, and won't sell you three when you need one. What’s at stake ## What ignoring a small boiler fault turns into A £180 diverter valve becomes a £2,600 boiler replacement faster than most people realise. ### Cold showers become cold radiators A failing diverter valve first shows as inconsistent hot water. Left alone, the same fault starts feeding your central heating with domestic hot water demand, and you lose heating entirely. ### Repeated pressure loss = leak somewhere A boiler that needs topping up weekly has a leak. Under floors it will rot joists; in ceilings it will bring one down. Fix the pressure, find the leak, always. ### Kettling damages the heat exchanger That banging noise is scale on the heat exchanger. It's fixable in the early stages. Left for a season, the heat exchanger cracks, and heat exchangers routinely cost more than a new boiler. ### Ignored error codes void warranty Manufacturers can and do reject warranty claims where a diagnostic code was displayed for weeks before failure and no service call was logged. Common mistakes we fix - Topping up boiler pressure repeatedly without finding the leak - Resetting a lockout code more than twice, you're masking a real fault - Bleeding radiators without dosing inhibitor afterwards - Calling out a 'handyman' rather than a Gas Safe engineer for a gas appliance - Assuming a low bill quote means a cheap repair, usually means one part changed on hope Our process ## From your first call to the completion certificate. - 1 ### Booking & triage Tell us your boiler make, model and error code on the phone; we'll come prepared with the likely parts. - 2 ### On-site inspection Full visual check, pressure test, gas rate, flue integrity check and combustion analysis. - 3 ### Fault diagnosis Clear explanation of what's wrong, what needs replacing, and what it will cost, in writing before any work starts. - 4 ### Repair execution Genuine OEM parts fitted, system re-pressurised, controls re-paired, tested through a full heating and hot water cycle. - 5 ### Honest advice Straight talk on whether a service, powerflush or replacement is the sensible next step, before you spend another penny. Benefits ## What you actually get for the money. ### Rapid diagnostics Book by lunchtime and we're usually on-site as quickly as we can across SE London. ### Fixed diagnostic fee £80 flat to find the fault, deducted from the repair if you go ahead. ### OEM parts only We fit manufacturer parts as standard, pattern parts fail inside 12 months and void warranty. ### Honest repair-vs-replace advice If a repair doesn't stack up economically, we'll tell you and quote both options. ### Boiler service on request We can service the boiler at the same visit for £75, extending its life and protecting warranty. Technical detail ## The boilers, faults and parts we handle every week Forty years of boiler work across South East London has narrowed the population of real-world faults down to a manageable list. Here's what we see, and how we fix it. ### Vaillant faults we see most EA lockout (flame loss, usually a dirty flame sensor, gas valve or PCB), D1/D5 (fan or air-pressure switch), C6 (fan speed), F1 (low pressure, leak or expansion vessel failure). We hold Greenstar diverter valves, PRV, PCBs and expansion vessels on the van. ### Vaillant ecoTEC diagnostics F22 (low water pressure), F28/F29 (ignition failure, often a gas supply issue), F75 (pump/pressure sensor), F62 (delayed shutdown gas valve). Vaillant PCBs and diverter cartridges are a common on-the-day fix. ### Baxi, Ideal and Glow-worm Baxi Duo-tec E133 (flue restriction, often just a swept flue), Ideal Logic L2 (flame loss), Glow-worm F1 (pressure) or F22 (dry-fire). We know the quirks and carry the parts that fail on each. ### Common cross-manufacturer failures Diverter valves, PRVs, expansion vessels, auto air vents, ignition electrodes, PCBs, gas valves and pumps account for roughly 80% of all real-world combi callouts. We stock them. ### When repair doesn't add up If your boiler is 10+ years old, out of warranty, and needs a PCB or heat exchanger, we'll show you the honest maths on a new boiler installation instead of quoting a repair you'll spend twice. ### Landlord repairs For tenanted properties in Woolwich, Plumstead and Abbey Wood we can log the repair with your CP12, invoice through your letting agent, and prioritise prompt attendance where a tenant is without heat or hot water. Frequently asked ## Questions we hear every week. How much does a boiler repair cost?+The diagnostic call-out is £80. Most in-warranty parts jobs land £180–£320 all-in; a PCB or gas valve replacement can be £380–£520 depending on model. We quote in writing before any parts are fitted. Can you fix my boiler quickly?+Usually, yes, if you call before 11am we work to diagnose as quickly as we can across SE London and North West Kent. Emergency no-heat calls in winter are prioritised. My boiler shows an error code, what does it mean?+Tell us the make, model and code when you book. We'll tell you on the phone what it usually means and which parts we'll bring on the van, saving you a return visit. Is it worth repairing an old boiler?+Below 8 years old, almost always yes. 8–12 years, depends on the fault. Over 12 years and out of warranty, often not; we'll show you the maths honestly. Do you work on landlord properties?+Yes, we handle repairs for private landlords and letting agents across SE London and can bundle with the annual CP12 gas safety certificate. What if my boiler smells of gas?+Turn the boiler off, open windows, don't switch anything electrical on or off, and call the National Gas Emergency Service on 0800 111 999 first. Then call us for the repair. Do you carry parts on the van?+Yes, full stock of Vaillant, Baxi, Ideal and Glow-worm consumables. About 85% of jobs are fixed on the first visit. Book boiler repairs ## Ready to get boiler repairs sorted properly? Speak to Danny directly. Free quote in writing, honest advice, and a fair fixed price. No sales pressure, we’ve been at this for over 30 years for a reason. Call 07956 994429 Call 020 8244 0912Request estimate - Gas Safe registered #180521 - 4.9★ from 159 Google reviews - Office 8am–9pm, 7 days a week - Based in Greenwich · covers all SE London Related services ## Often booked together. See all services → Service ### Boiler Installation Learn more Service ### Gas Safety Engineer Learn more Service ### Power Flushing Learn more Service ### Landlord Gas Safety (CP12) Learn more Gas Safe registered plumbing, gas & heating engineers with 40 years of local experience across South East London. Gas Safe #180521 Company No. 06064438 Services - Boiler Installation - Boiler Repairs - Power Flushing - Gas Safety Engineer - Landlord Gas Safety (CP12) - Gas Fires & Cookers - Heating Engineer - Central Heating Installation Service Areas - Greenwich · Woolwich - Blackheath · Eltham - Thamesmead · Plumstead - Abbey Wood · Erith - Dartford · Bexley · Sidcup Contact - 07956 99442924/7 Emergency - 020 8244 0912Office landline - info@dhplumbing.co.uk - London - Office: 8am – 9pm, 7 days a week © 2026 DHP London Ltd. All rights reserved. AboutOur WorkReviewsContactPrivacyTerms Call nowGet a quote