Open 24/7 · 7 days a week info@btdplumbingheating.co.uk 07920 042880 HomeAboutServices Service Areas Our WorkReviewsContact07920 042880 Off-grid heating fixed fast # Oil boiler repairsdiagnosed properly, fixed once Lockouts, no-fires, sooting, smoke, oil leaks or a boiler that just won't hold pressure, diagnosed by an OFTEC-registered oil specialist, priced clearly, fixed the first time. Request a Free Quote 07920 042880 OFTEC C11108 · Emergency call-outs available · Free written quote before work - Home - Services - Oil Boiler Repairs - C11108 OFTEC business - 28212 Technician reg. - 18 years Experience - Available Emergency call-outs - Free Quote before work Overview ## A straight explanation of what we do, and why it matters When an oil boiler goes down in a Wiltshire winter it's more than an inconvenience, off-grid homes have no gas back-up and immersion-only hot water gets old fast. We diagnose properly, quote in writing and fix once. Back to home What it isFault-finding and repair for oil-fired boilers, burners, oil lines, tanks and system controls. Everything from a repeat lockout on a Worcester Danesmoor to a full Grant Vortex burner rebuild, a leaking Firebird flexi, a Trianco electrode set or a Warmflow that won't hold pressure. Who it's forHomeowners, landlords, farms and businesses across Broad Town, Royal Wootton Bassett, Marlborough, Calne, Swindon and the surrounding rural villages, any UK oil boiler brand, any age, whether we installed it or not. When you need itAs soon as the fault appears. A boiler that's locking out, smoking, running noisy, smelling of oil or leaving soot around the case is telling you something. The longer it runs like that, the more damage builds up and the bigger the eventual bill. Why professional mattersOil boiler faults are rarely random. Nine out of ten sit in a small handful of causes, nozzle, electrodes, photocell, pump pressure, fuel supply, controls, and the right diagnostic order finds them fast. Guesswork replaces parts you didn't need and misses the ones you did. Manufacturer accredited ## Grant UK G1 Approved Oil Boiler Installer We're a Grant UK G1 Approved Installer, recognised by Grant for our installation standards, technical expertise and commitment to ongoing manufacturer training. Every Grant oil boiler we fit is installed in accordance with the manufacturer's recommendations, giving you the performance, reliability and efficiency the unit was designed to deliver. Choosing a G1 Approved Installer also means eligible Grant boilers can qualify for Grant's extended manufacturer guarantees, giving you added peace of mind and long-term protection on your new heating investment. - New installations & replacements - Annual servicing & maintenance - Extended manufacturer guarantees on eligible models - Installed to Grant UK's exact specifications The cost of leaving it ## What happens when it's ignored A dead oil boiler on a Friday evening in January isn't the moment to be phoning round asking who knows oil. Risks & escalations - Repeated lockouts almost always leave unburnt fuel in the combustion chamber, a genuine fire risk on restart. - Running with a partial blockage sooties up the heat exchanger fast, cutting efficiency and eventually cracking cast-iron sections. - Leaking oil lines contaminate soil and, near a drain, watercourses, a legal problem as well as an expensive clean-up. - No heat means frozen pipework in a cold spell. Burst pipes cost multiples of a boiler repair. - A misdiagnosed fault often means paying twice, once for the wrong part, once for the right one. Common mistakes - Repeatedly resetting a boiler that keeps locking out; it's not a nuisance, it's a diagnostic. - Topping up pressure without finding out where it's going. - Calling a gas engineer to look at an oil boiler. Different fuel, different regulator, different rules. - Ignoring a strong oil smell around the boiler or tank. Small drips become big bills. Ring us first, describe the symptoms honestly, and we'll bring the parts that fit that fault profile. Most repairs are done in one visit. Our process ## A clear, five-step system, no surprises - Step 1 Symptom triage on the phone Brand, model, age, what happens when you press reset, any noises, smells or sooting. Half the diagnosis often starts here. - Step 2 On-site fault diagnosis Electrical checks, fuel supply pressure, combustion analysis and visual strip of the burner as needed. No guessing. - Step 3 Written quote before work Once we know what's wrong, you get a clear price for the fix | parts and labour | before we do it. - Step 4 Repair to manufacturer spec Genuine or OFTEC-approved parts, tightened to spec, seals renewed, combustion re-tested with an analyser. - Step 5 Test, sign-off and guarantee Full firing sequence tested, safety devices verified, report handed over. Any issue with our workmanship is put right personally. The benefits ## Concrete outcomes, not vague promises Right diagnosis, first time Eighteen years of oil work means the shortlist of likely causes is short. Less time on your job, less on your bill. Repaired to OFTEC standard Combustion re-analysed after every repair | not just 'it fired up, off I go'. Fast on urgent no-heats Emergency call-outs available. We prioritise no-heat, vulnerable-occupant and safety-critical faults. Priced honestly, in writing You approve the price before any spanner turns. No surprise invoices. Fixed once, not repeatedly We find the underlying cause, not just the symptom that tripped the boiler out. Genuine parts Nozzles, pumps, photocells and electrodes to manufacturer spec | no bargain-bin substitutes. In detail ## The technical stuff, explained straight Where the theory meets the van. Materials, methods, brand differences and the specific situations we deal with week in, week out across Wiltshire. ### The most common oil boiler faults | and what they actually mean Lockout on start-up: usually a worn nozzle, dirty photocell or a fuel supply issue. Rumbling or delayed ignition: nozzle sizing, air setting or an electrode gap out of spec. Sooting inside the boiler casing: combustion running rich, often nozzle, air damper or a fuel pump losing pressure. Kettling and expansion noise: heat exchanger fouled, poor circulation or system water quality. Pressure won't hold: expansion vessel gone flat, PRV weeping, hidden leak on system pipework. Boiler fires then stops on flame failure: photocell, electrodes, transformer or fuel supply. We work through them in diagnostic order, verify with instruments and fix the cause, not the symptom. ### Brand-specific know-how Worcester Bosch Greenstar Danesmoor: sensitive to fuel filter condition and pump pressure. Grant Vortex: baffle sets and combustion chamber liners matter; we carry spares. Firebird Enviroblue: flexi hoses and burner gaskets on the shortlist. Warmflow: photocell and lockout module frequently misdiagnosed. Trianco TRO/TRG: electrode set and combustion head fouling. Mistral, Boulter Camray, HRM Wallstar and Riello-burnered models, all regulars on the van. ### Oil supply | the fault that's rarely 'the boiler' An enormous share of 'boiler' callouts turn out to be fuel supply. Water in the tank, sludge across the take-off, a partially blocked filter, a fire-valve that's dropped shut, a flexi hose split at the burner. We check the whole supply, tank, isolation, filter, fire-valve, remote sensor and flexis, as part of every diagnosis, because replacing a nozzle without fixing bad fuel just brings you back next week. ### Sealed system faults on oil boilers Most modern oil boilers run on sealed systems, and repeat pressure loss is the most common non-combustion fault we see. Causes: failed expansion vessel (needs recharging or replacing), passing PRV, hidden radiator or pipework leak, cracked heat exchanger, or air being drawn in through auto-air vents. We pressure-test properly rather than just topping you up and hoping. ### When repair stops being sensible If a boiler is over fifteen years old, off-parts-support, or facing a heat-exchanger crack or major casting failure, we'll say so and give you honest numbers for both routes, repair vs replacement, so you can decide on facts, not sales pressure. FAQs ## The questions we're asked most Can't see yours? Give us a ring; we don't do sales scripts. Call 07920 042880 Do you charge a call-out fee?We don't run a flat call-out or fixed-price structure, pricing depends on the job. What we do promise is a straight answer on the phone and a written quote before any work is carried out. How quickly can you come out? Can you repair my brand of oil boiler? What if you can't fix it on the first visit? Is there a guarantee on the repair? My boiler keeps locking out, is that dangerous? Do I need a new boiler or can this be repaired? Will my warranty be affected if you repair it? Do you cover my area? Can you service it while you're there? Free written quote · no pressure ## Boiler down or misbehaving? Get a real answer today. Tell us the symptoms and we'll bring the parts to match. Free quote before any work, no scripts, no scare tactics. - Gas Safe 529962 - OFTEC C11108 - 18 years' experience 07920 042880Request a Free Quote Related services ## Often booked alongside Oil Boiler Repairs All services Oil Boiler Servicing Oil Boiler Installation Central Heating Systems Oil-fired heating specialists and fully qualified gas engineers, serving Broad Town and rural Wiltshire since 2007. Leave a review ### Services - Oil Boiler Servicing - Oil Boiler Repairs - Oil Boiler Installation - Gas Boiler Servicing - Gas Boiler Repairs - Gas Boiler Installation - Water Softener Installation - Central Heating Systems - All services → ### Service Areas - Broad Town - Royal Wootton Bassett - Broad Hinton - Lyneham - Wroughton - Marlborough - Yatesbury - Swindon - Calne ### Contact - 07920 042880 - info@btdplumbingheating.co.uk - Pye Lane, Broad Town, Swindon, SN4 7RRGas Safe Reg. 529962 OFTEC Reg. C11108 · Tech. 28212 City & Guilds Qualified Grant UK G1 Approved Installer © 2026 BTD Plumbing & Heating. All rights reserved. AboutContactPrivacyTermsCookiesOpen 24/7 · Mon–Sun Call NowRequest Quote