--- title: "Fault Finding Electrician Cobham | Electrical Diagnostics" description: "Expert electrical fault finding in Cobham & Surrey. Tripping circuits, flickering lights and power loss diagnosed and fixed fast. NAPIT registered." lang: en json-ld: | [ { "@context": "https://schema.org", "@type": "Service", "name": "Fault Finding & Diagnostics", "provider": { "@id": "https://cobhamelectrical.co.uk/#business" }, "areaServed": [ "Cobham", "Surrey", "Weybridge", "Esher", "Oxshott" ], "description": "Expert electrical fault finding and diagnostics across Cobham and Surrey. Professional diagnosis and permanent repair." }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How much does fault finding cost?", "acceptedAnswer": { "@type": "Answer", "text": "We charge a fixed diagnostic fee that covers the first hour of investigation, testing, and diagnosis. If the repair is straightforward and can be completed during the visit, we quote for the repair separately. For complex faults requiring extended investigation, we agree pricing with you before proceeding." } }, { "@type": "Question", "name": "How long does fault finding take?", "acceptedAnswer": { "@type": "Answer", "text": "Simple faults (like a failed appliance tripping an RCD) can be identified in 15–30 minutes. More complex issues (intermittent faults, degraded wiring) may take 1–3 hours. We keep you informed throughout and never charge for time spent without your agreement." } }, { "@type": "Question", "name": "My circuit breaker keeps tripping — what should I do?", "acceptedAnswer": { "@type": "Answer", "text": "First, unplug all appliances on the affected circuit and try resetting the breaker. If it holds, plug appliances back in one at a time to identify the culprit. If it trips with nothing connected, there's a wiring fault — call us on 07935 839378." } }, { "@type": "Question", "name": "Can you find faults in commercial properties?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We carry out fault finding in offices, retail premises, restaurants, and light industrial units across Surrey. Commercial fault finding follows the same systematic approach with additional considerations for three-phase systems and specialist equipment." } }, { "@type": "Question", "name": "What areas do you cover?", "acceptedAnswer": { "@type": "Answer", "text": "Cobham, Weybridge, Esher, Oxshott, Walton-on-Thames, Dorking, Godalming, Guildford, and the wider Surrey area." } }, { "@type": "Question", "name": "Will I need to be home during fault finding?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We need access to the consumer unit and the affected areas. Fault finding involves testing circuits which may require temporary power interruptions." } }, { "@type": "Question", "name": "What if the fault is intermittent?", "acceptedAnswer": { "@type": "Answer", "text": "Intermittent faults are challenging but solvable. We use systematic testing, thermal imaging, and insulation resistance trending to identify causes that only manifest under specific conditions. Our experience with these faults across Surrey properties means we know where to look." } }, { "@type": "Question", "name": "Do you provide a guarantee on fault repairs?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. All fault repairs are guaranteed and backed by full testing and certification. If the same fault recurs, we return at no additional charge." } } ] }, { "@context": "https://schema.org", "@type": "Organization", "name": "Cobham Electrical Contractors", "url": "https://cobhamelectrical.co.uk", "logo": "https://cobhamelectrical.co.uk/logo.png", "telephone": "07935 839378", "email": "cobhamelectricalcontractors@outlook.com", "address": { "@type": "PostalAddress", "streetAddress": "32 Between Sts", "addressLocality": "Cobham", "addressRegion": "Surrey", "postalCode": "KT11 1AF", "addressCountry": "GB" }, "sameAs": [ "https://www.instagram.com/cobhamelectricalcontractors/" ] }, { "@context": "https://schema.org", "@type": "WebSite", "name": "Cobham Electrical Contractors", "url": "https://cobhamelectrical.co.uk", "potentialAction": { "@type": "SearchAction", "target": "https://cobhamelectrical.co.uk/?s={search_term_string}", "query-input": "required name=search_term_string" } }, { "@context": "https://schema.org", "@type": "Electrician", "@id": "https://cobhamelectrical.co.uk/#business", "name": "Cobham Electrical Contractors", "image": "https://cobhamelectrical.co.uk/logo.png", "telephone": "07935 839378", "email": "cobhamelectricalcontractors@outlook.com", "address": { "@type": "PostalAddress", "streetAddress": "32 Between Sts", "addressLocality": "Cobham", "addressRegion": "Surrey", "postalCode": "KT11 1AF", "addressCountry": "GB" }, "url": "https://cobhamelectrical.co.uk", "priceRange": "££", "openingHoursSpecification": { "@type": "OpeningHoursSpecification", "dayOfWeek": [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" ], "opens": "00:00", "closes": "23:59" }, "areaServed": [ "Cobham", "Surrey", "Oxshott", "Weybridge", "Esher", "Walton-on-Thames", "Dorking", "Godalming", "Guildford" ], "description": "Trusted electrician in Cobham & Surrey. 10+ years experience, NAPIT registered, fully insured. Emergency call-outs, rewires, EICRs, EV chargers & more.", "aggregateRating": { "@type": "AggregateRating", "ratingValue": "4.9", "reviewCount": "9", "bestRating": "5" } }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://cobhamelectrical.co.uk/" }, { "@type": "ListItem", "position": 2, "name": "Services", "item": "https://cobhamelectrical.co.uk/services" }, { "@type": "ListItem", "position": 3, "name": "Fault Finding & Diagnostics" } ] } ] --- [07935 839378 ](tel:07935839378)[cobhamelectricalcontractors@outlook.com ](mailto:cobhamelectricalcontractors@outlook.com) Mon–Sat 8am–6pm · 24/7 Emergency Call-Outs [![Cobham Electrical Contractors](/assets/logo-DBNOQcU-.png)](/) [Home](/)[About](/about) [Services](/services) [Our Work](/our-work) [Areas We Cover](/areas) [Reviews](/reviews)[Specials](/specials)[Contact](/contact) [07935 839378](tel:07935839378)[Request Estimate](/contact) ![Electrical fault finding with multimeter testing at a consumer unit in Surrey](/images/work/megger-testing.jpg) 1. [Home](/) 2. [Services](/services) 3. Fault Finding & Diagnostics Fault Finding & Diagnostics # Expert Electrical Fault Finding in Cobham Tripping circuits, flickering lights, or unexplained power loss? We use professional diagnostic equipment to find the root cause and fix it — not patch it. [Request a Free Estimate](/contact) [07935 839378](tel:07935839378) Diagnosed and fixed in one visit · No guesswork · 10+ years diagnostic experience Same Day Resolution NAPIT Registration Fully Insured Coverage Root Cause Approach 4.9★ Rating ## What Is Electrical Fault Finding? Electrical fault finding is the systematic process of identifying the cause of an electrical problem within a property's fixed wiring installation. Unlike simply resetting a tripped breaker or replacing a blown fuse, proper fault finding determines why the problem occurred and eliminates the root cause. Common symptoms that require fault finding include circuits that trip repeatedly, lights that flicker or dim without explanation, sockets that stop working, burning smells from electrical accessories, unusual buzzing or humming sounds, and unexpectedly high electricity bills. At Cobham Electrical Contractors, we use professional multifunction testers, insulation resistance meters, thermal imaging cameras, and circuit tracing equipment to diagnose faults accurately. Our approach is methodical — we don't guess, and we don't charge you to experiment. We attend fault-finding call-outs across Cobham, Weybridge, Esher, Oxshott, and the wider Surrey area. Most faults are diagnosed and repaired in a single visit. Need expert help? [Get a free, no-obligation estimate](/contact) or call [07935 839378](tel:07935839378) — we respond within 2 hours. ## Our Fault Finding & Diagnostics Work ![Completed electrical installation with integrated LED lighting in Surrey home](/images/work/lounge-led-shelving.jpg) ![EV charger installation completed and tested on brick wall in Cobham](/images/work/ev-charger-brick.jpg) ## Why Ignoring Electrical Faults Is Dangerous Electrical faults rarely fix themselves. A tripping circuit breaker is a safety device telling you something is wrong. Repeatedly resetting it without investigation puts you at risk: - Intermittent faults often indicate degraded insulation — live conductors may be exposed inside walls or ceilings - Loose connections generate heat under load, which can ignite surrounding materials and cause house fires - A buzzing consumer unit indicates arcing — electrical discharge that degrades connections and can lead to catastrophic failure - Flickering lights may indicate a loose neutral connection, which can cause dangerous overvoltage on other circuits - Repeated RCD tripping left uninvestigated desensitises occupants to warnings, increasing the risk of injury when a genuine fault occurs - Water ingress into wiring or accessories creates shock hazards that worsen progressively ## How We Diagnose Electrical Faults 1 ### Symptom Assessment You describe the problem — when it occurs, how often, and any patterns you've noticed. This initial information guides our testing strategy and helps us focus on the most likely causes. 2 ### Visual Inspection We inspect the consumer unit, affected circuits, and relevant accessories. We look for signs of overheating, damage, moisture, rodent activity, and non-compliant previous work. Often, visual clues narrow the diagnosis significantly. 3 ### Systematic Testing Using professional multifunction testers, we measure insulation resistance, continuity, earth fault loop impedance, and RCD operation on the affected circuits. These tests identify faults that are invisible to visual inspection. 4 ### Fault Isolation We systematically isolate sections of the circuit to pinpoint the exact location and cause of the fault. This may involve testing individual accessories, junction boxes, and cable sections. 5 ### Repair & Verification Once identified, we repair the fault using proper materials and methods. The repaired circuit is retested to confirm the fault is fully resolved and the installation is safe. ## Why Choose Us for Fault Finding ### Root Cause Resolution We don't patch symptoms. We find the actual cause of the problem and eliminate it permanently. No repeat call-outs for the same issue. ### Professional Diagnostic Equipment Multifunction testers, insulation resistance meters, thermal imaging, and circuit tracers — the right tools for accurate diagnosis. ### 10+ Years of Diagnostic Experience A decade of solving electrical faults across Surrey means faster diagnosis and fewer hours on-site. Experience saves you money. ### Transparent Pricing We explain what we've found, what needs to be done, and what it will cost before we carry out repairs. No surprises. ### Most Faults Fixed Same Day The majority of faults are diagnosed and repaired in a single visit. We carry common parts and materials to resolve issues on the spot. ### Full Testing After Repair Every repair is followed by comprehensive testing to confirm the fault is resolved and the circuit meets BS 7671 standards. ## Common Electrical Faults in Cobham & Surrey Properties The types of electrical faults we encounter most frequently vary with property age. In pre-1970s properties common across Cobham and Surrey, we regularly find degraded rubber insulation that has become brittle and cracked, exposing copper conductors. This causes insulation resistance readings to drop below safe levels and often results in persistent RCD tripping. Properties from the 1970s and 1980s frequently have aluminium wiring in certain circuits, or a mix of old and new wiring from multiple modifications over the decades. Poor connections between different conductor materials (copper to aluminium) create high-resistance joints that overheat under load — a common cause of burning smells and discoloured accessories. Modern properties are not immune to faults. Poor workmanship from unqualified installers, DIY modifications, and damage from renovation work (nails through cables, severed conductors from drilling) account for a significant proportion of fault-finding call-outs. Rodent damage to wiring in loft spaces and subfloor voids is also surprisingly common in rural Surrey properties. Moisture-related faults are particularly prevalent in bathrooms, kitchens, and outdoor installations. Failed seals on bathroom extractor fans, condensation inside outdoor junction boxes, and leaking roofs allowing water to track along cables all cause earth faults that trip RCDs. Nuisance RCD tripping — where the RCD trips without an obvious cause — is one of the most challenging fault types. It can be caused by cumulative earth leakage across multiple circuits (each within limits individually, but exceeding the RCD threshold collectively), or by appliances with inherently high earth leakage (older fridges, certain LED drivers, and some types of immersion heater). We also attend call-outs for intermittent faults that occur under specific conditions — for example, lights flickering only when the central heating activates, or a socket that stops working when it rains. These require systematic investigation and sometimes thermal imaging to identify the cause. We provide fault finding & diagnostics services across [Cobham](/areas/cobham), [Weybridge](/areas/weybridge), [Esher](/areas/esher), [Oxshott](/areas/oxshott), [Walton-on-Thames](/areas/walton-on-thames), [Dorking](/areas/dorking), [Godalming](/areas/godalming), [Guildford](/areas/guildford), and the wider [Surrey](/areas/surrey) area. Read our [customer reviews](/reviews) or view [examples of our work](/our-work). ## Frequently Asked Questions ### How much does fault finding cost? ### How long does fault finding take? ### My circuit breaker keeps tripping — what should I do? ### Can you find faults in commercial properties? ### What areas do you cover? ### Will I need to be home during fault finding? ### What if the fault is intermittent? ### Do you provide a guarantee on fault repairs? ## Related Services [Emergency Electrician](/services/emergency-electrician)[EICR Certificates](/services/eicr-certificates)[Consumer Unit Upgrades](/services/consumer-unit-upgrades)[Full & Partial Rewires](/services/rewires)[Contact Us](/contact)[Home](/) ![Professional electrical work by Cobham Electrical Contractors in Surrey](/images/cta-bg.jpg) ## Ready to Get Started? Every job is backed by 10+ years of experience, full insurance, and a workmanship guarantee. No call-out fees for estimates. No obligation. [Request Your Free Estimate](/contact) [07935 839378](tel:07935839378) NAPIT registered · Fully insured · Available 24/7 ![Cobham Electrical Contractors](/assets/logo-DBNOQcU-.png) Trusted electricians serving Cobham, Surrey & surrounding areas. 10+ years of experience. Fully insured & NAPIT registered. Company No. 17136520 ### Quick Links - [About](/about) - [Services](/services) - [Our Work](/our-work) - [Areas We Cover](/areas) - [Reviews](/reviews) - [Specials](/specials) - [Contact](/contact) ### Our Services - [General Electrical Work](/services/general-electrical-work) - [EICR Certificates](/services/eicr-certificates) - [Full & Partial Rewires](/services/rewires) - [Consumer Unit Upgrades](/services/consumer-unit-upgrades) - [Emergency Electrician](/services/emergency-electrician) - [EV Charger Installation](/services/ev-charger-installation) - [Fault Finding](/services/fault-finding) - [Lighting Installation](/services/lighting-installation) ### Contact Us - [07935 839378](tel:07935839378) - [cobhamelectricalcontractors@outlook.com](mailto:cobhamelectricalcontractors@outlook.com) - 32 Between Sts, Cobham, Surrey KT11 1AF - [Follow us on Instagram](https://www.instagram.com/cobhamelectricalcontractors/) © 2026 Cobham Electrical Contractors. All rights reserved. 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