Carterton, Oxfordshire, serving Witney, Oxford & the Cotswolds admin@pinnacle-plumbing.co.ukMon–Fri 8:30–5 · Sat & Sun emergency call-outs only AboutServicesGeneral Plumbing Repairs & MaintenanceEmergency Plumber & Call-OutsBoiler Installation & ReplacementBoiler Servicing & Gas SafetyBoiler Repairs & BreakdownsCentral Heating & Underfloor HeatingBathroom Renovations & InstallationsAir Source Heat Pumps & RenewablesLandlord Gas Safety Certificates (CP12)Estate & Letting Agent SupportNew Build & Development PlumbingRadiator & Valve Work Something not listed? Just ask — we take on most plumbing & heating work. View all → AreasWitneyCartertonOxfordOxfordshireAbingdonBicesterCotswoldsWoodstockMoreton-in-Marsh We also work outside these areas, including larger projects further afield. View all → Our WorkReviewsContact01865 306381Get a Free Quote New Boilers From £2,000 — 7+ years warranty, free fixed-price quote Get my quote Home/Services/Boiler RepairsBoiler Repairs · Witney, Oxford & Oxfordshire # Boiler Repairs & Breakdownsin Witney, Oxford& Oxfordshire. Locked-out combi, no hot water, weeping seal, fault code you don't understand? Gas Safe registered diagnostics, fixed price in writing, and the parts on the van to finish the vast majority of repairs on the first visit. Get a Free QuoteCall 01865 306381 Priority breakdown responseFixed-price repair, quoted firstVaillant & Worcester approved Gas Safe Registered Every gas engineer individually qualified Priority Emergency Response Emergencies prioritised within working hours Vaillant Approved Genuine parts & diagnostics Worcester Approved Manufacturer register 5.0 on Google Reviewed by Oxfordshire homeowners What we do ## Boiler Repairs, explained properly. What it is Boiler repair covers everything from a simple pressure top-up and reset to full component replacement (PCBs, fans, diverter valves, expansion vessels, gas valves, heat exchangers), carried out under Gas Safe regulations. Who it's for Any Oxfordshire homeowner or landlord with a locked-out, leaking or under-performing gas boiler. Combi, system and regular. All major brands. When you need it The moment the boiler drops out, throws a fault code, leaks visibly, loses pressure repeatedly, or fails to reach temperature. Small faults become expensive fast if ignored. Why a qualified team matters Gas work is legally restricted to Gas Safe registered engineers. Beyond the law, a wrong diagnosis on a modern boiler wastes hundreds, a new PCB is not the answer to a £30 sensor. Manufacturer-approved diagnostics find the real fault the first time. What happens if it's left ## The cost of ignoring it. A ignored boiler fault is the reason for most 'sudden' January breakdowns, the warning signs were there in October. ### Bigger repair bill A failing pump run hot for weeks can burn out the motor, destroy the diverter valve and cook the PCB. What was a £180 pump becomes an £800 rebuild. ### No heat in cold weather Ignored fault codes tend to escalate to full lockout at the worst possible time. Engineer availability collapses in a cold snap. ### Safety hazards Combustion, flue and CO risks live inside a poorly maintained boiler. Only a Gas Safe engineer can lawfully diagnose and sign off. ### Voided warranty Unauthorised or DIY repairs void manufacturer cover, even if the fix seems successful, the warranty is gone. ### Common mistakes we see - •Repeatedly topping up pressure to mask a hidden leak in the system - •Resetting a fault code over and over instead of investigating it - •Booking a general handyman for a boiler (illegal, must be Gas Safe) - •Fitting a cheap universal part instead of manufacturer-approved - •Ignoring gurgling, kettling or banging sounds, all early warnings Our process ## How we run the job. - 01 ### Phone triage We ask the fault code, the symptoms and the boiler model. Some issues resolve on the phone. Everything else gets the earliest booking we can offer. - 02 ### On-site diagnostics Case off, manufacturer-approved diagnostics, live readings, gas rate and combustion checks. We find the real fault, not the visible one. - 03 ### Fixed-price repair quote Before ordering parts or spending your money, you get a fixed price. We'll also tell you honestly if repair no longer makes sense vs. replacement. - 04 ### Repair on visit one where possible Common failure parts on the van, sensors, PRVs, expansion vessels, diverter cartridges, diaphragms. Most breakdowns finish on the first visit. - 05 ### Test & document Combustion tested, benchmark logbook updated, warranty on parts confirmed. Every repair is documented for future service history. Benefits ## What you actually get. ### One visit, most of the time Stocked vans and correct first-time diagnostics mean the majority of breakdowns are fixed on the first visit. ### Honest repair-vs-replace advice If your boiler is beyond economic repair, we'll say so and quote a replacement, not sell you a bandage that fails again. ### Manufacturer warranty passed on Every part we fit carries its own manufacturer warranty, registered and passed straight on to you. ### Approved diagnostics Vaillant and Worcester approved means we use manufacturer diagnostic kit and genuine parts. ### Transparent pricing Fixed prices in writing before work starts. No hourly meter, no surprise bills. ### Same team for service & repair Continuity, the engineer who repairs today can service next year and knows the boiler's history. The detail ## Depth, not filler. Modern gas boilers fail in predictable patterns. Here's what we see most often across Oxfordshire homes. ### Pressure loss & PRV failures Constant pressure drops usually mean a hidden system leak, a failed expansion vessel, or a passing PRV. We isolate the cause instead of just topping up. ### No hot water, heating fine Classic diverter valve or plate heat exchanger fault on a combi. Replaceable parts, priced clearly. ### No heating, hot water fine Often a stuck motorised valve, dead pump, or programmer fault. Diagnosed with meter readings, not guesswork. ### Fault codes & lockouts F22, F28, F75, EA, E133, we know what they mean on Vaillant, Worcester, Ideal, Baxi and more, and what actually causes them. ### Kettling & banging Almost always limescale in the heat exchanger or magnetite build-up in the system. A full system clean usually resolves it, see Central Heating. ### Fan, PCB & sensor failures The 'expensive' repairs. We only replace what's actually failed, approved diagnostics stop unnecessary PCB swaps. ### Condensate freeze in winter Common Oxfordshire winter call: a lagged condensate line stops it happening. We can fit protection as part of the visit. ### When repair no longer makes sense If you're on your third major repair on a 12+ year-old boiler, replacement is usually cheaper over 2 years than continuing to patch. We'll show you the numbers honestly. FAQs ## Straight answers. ### How much does a boiler repair cost? Repairs are priced per job. We diagnose the fault first, then quote in writing before any work starts, so you approve the price before we begin. Quotes are always free. ### How fast can you come out? For no-heat and no-hot-water calls we prioritise the earliest available slot during working hours across Witney, Oxford, Carterton and surrounding areas. ### Do you fix all brands? Yes, Vaillant, Worcester Bosch, Ideal, Baxi, Alpha, Glow-worm, Viessmann and others. We're specifically approved on Vaillant and Worcester Bosch. ### What's a call-out fee? We don't do 'call-out + then extras' pricing. On arrival we diagnose the fault and give you a fixed price for the repair. If you decline, you pay a fair diagnostic fee only. ### Is my boiler worth repairing? Depends on age, brand, and cost of repair vs. new. Broadly: under 8 years old, repair almost always makes sense. Over 12 years with a major fault, it often doesn't. We'll give you the maths. ### Is the replacement part covered? Yes, every replacement part carries its own manufacturer warranty, which we register and pass on to you. ### Will a repair void my warranty? Only unauthorised work voids warranty. Gas Safe repair by an approved installer with correct parts and documentation keeps warranty intact. ### Can you also service it while you're there? Often yes, if it makes sense to combine the visit we can carry out the service on the day. We'll price it before we start. ## Related services All services Boiler Service A proper boiler service: stripped, cleaned, tested and recorded, not a five-minute visual check. Learn more Boiler Installation New A-rated boilers installed by Vaillant and Worcester Bosch approved engineers. Learn more Emergency Plumber Burst pipe, no water, no heat, leaking cylinder or overflowing WC? A qualified Gas Safe engineer on the phone in minutes and, in most cases, on your doorstep within hours, with the parts to actually fix it. Learn more Ready when you are ## Get a fixed-price quote for boiler repairs in Witney, Oxford. Free, no-obligation quote in writing. Gas Safe registered, fully insured to £5m. Local team, real engineers, no call centres. Get a Free QuoteCall 01865 306381 Gas Safe RegisteredManufacturer Approved£5m Public Liability Gas Safe registered plumbing & heating engineers serving Oxfordshire and the Cotswolds since 2020. - ### Services General Plumbing Repairs - Emergency Plumber - Boiler Installation - Boiler Servicing - Boiler Repairs - Central Heating - Bathroom Renovations - Air Source Heat Pumps ### Areas - Plumber in Witney - Plumber in Carterton - Plumber in Oxford - Plumber in Oxfordshire - Plumber in Abingdon - Plumber in Bicester - Plumber in Cotswolds - Plumber in Woodstock - Plumber in Moreton-in-Marsh ### Contact - 01865 306381 - admin@pinnacle-plumbing.co.uk - Carterton, OxfordshireMonday – Friday8:30 AM – 5:00 PM Saturday & SundayEmergency call-outs only © 2026 Pinnacle Plumbing & Heating Direct Ltd. All rights reserved. Privacy policyTerms & conditionsGas Safe · £5m PL Call NowFree Quote