07576 584901Testmasterinfo@gmail.com 24/7 online enquiries About Services Areas ReviewsOur WorkSocialContact07576 584901Request a Free Quote Home/Blog/EICR testingEICR testing # EICR codes meaning: interpreting observations and avoiding common mistakes By Test Master UK6 November 20263 min read Service illustration: eicr testingKnowing the meaning of EICR codes helps you ask useful questions, but a code is only part of an observation. The location, written description and inspector's reasoning are needed to understand the finding. This guide focuses on interpreting observations and common mistakes; the existing codes reference provides a concise explanation of the classifications themselves. ## Read a complete observation Start with the description and the affected circuit, board or accessory. If you cannot identify the location, ask the inspector to clarify it. Keep photographs and readings linked to the original observation where provided. A screenshot containing only C2 does not give a contractor enough information to specify the right remedy. A useful question is: what danger or potential danger does this finding describe, and what should happen next? Do not ask a non-electrician to decide the code from an online example. Similar-looking equipment can have different protective arrangements and surrounding conditions. ## C1 and C2: understanding urgency C1 identifies danger present, with risk of injury, and requires immediate remedial action. C2 identifies a potentially dangerous condition and requires urgent remedial action. Both make the overall outcome unsatisfactory. Follow competent advice on making the situation safe. Administrative deadlines do not authorise continued exposure to a dangerous condition. If there is an immediate electrical hazard, keep people away and obtain appropriate urgent assistance. Never open covers or reconnect something isolated for safety. ## C3 is not a whole-building safety guarantee C3 means improvement is recommended and does not alone make the report unsatisfactory. It does not say that every system in the property was assessed or that deterioration cannot occur later. Read the scope, limitations and other observations before drawing conclusions. An improvement may still be relevant to planned refurbishment, contractual conditions or other responsibilities. Keep it visible in maintenance planning instead of deleting it simply because it did not change the report's overall outcome. ## FI: the reporting edition matters The IET explains that BS 7671:2018+A4:2026 changed FI to 'further investigation is advised' and clarified that FI alone does not make the report unsatisfactory. Earlier reporting guidance treated FI differently. Ask which edition was used and what the inspector advises for your actual finding. Do not treat that change as permission to disregard investigation or property-specific legal duties. For a rental or business installation, discuss the complete report through residential EICR testing or commercial EICR testing, rather than commissioning a guessed repair from a code list. - Keep the code, description and location together. - Prioritise C1 and C2 appropriately. - Check the reporting edition for FI. - Retain investigation and completion evidence. ## Sources and further reading - IET: Further investigation and EICR classification changes in 2026 - GOV.UK: Electrical safety standards in rented homes - HSE: Electrical safety at workGeneral guidance for premises in England, checked on 6 November 2026. Requirements depend on your property, systems and applicable conditions. Follow competent advice, current official guidance and your local authority's requirements. ## In this guide - Read a complete observation - C1 and C2: understanding urgency - C3 is not a whole-building safety guarantee - FI: the reporting edition matters ## Need testing for your premises? Greenford-based electrical and fire safety services across London. Get a free quote 07576 584901 ## Related guides All guides EICR testing · 3 min read ## EICR testing codes explained: C1, C2, C3 and FI Read the common EICR testing observation codes, understand an unsatisfactory outcome and plan competent remedial work without overlooking urgent risks. 14 October 2026 EICR testing · 2 min read ## EICR report explained: how to read the scope, results and recommendations Read an EICR report beyond the summary: check property details, scope, limitations, test schedules, observations and the recommended next inspection date. 6 November 2026 Electrical and fire safety compliance testing for businesses, property managers and landlords across London and Greenford. 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