What Do C1, C2, C3 and FI Mean on an EICR?
A clear explanation of electrical inspection classification codes
C1 means danger is present and immediate action is required. C2 means a potentially dangerous condition needs urgent remedial action. C3 is a recommendation for improvement and does not by itself make the report unsatisfactory. FI means further investigation is required without delay because safety cannot yet be determined.
C1: Danger present
A C1 observation identifies a condition where people using the installation are at risk. The inspector should take action to remove or reduce the immediate danger where reasonably practicable and authorised, or provide urgent written warning if it cannot be made safe at once.
A C1 results in an unsatisfactory overall assessment. The affected part should not simply remain in normal use while quotations are gathered.
C2: Potentially dangerous
C2 is used where a condition is not necessarily presenting immediate danger at the moment of inspection but could become dangerous in reasonably foreseeable circumstances. Urgent remedial action is required.
C2 also results in an unsatisfactory report. The observation should describe the defect clearly rather than rely on a vague phrase or only cite a regulation number.
C3: Improvement recommended
C3 records an item that would improve safety but is not classified as dangerous or potentially dangerous. A report containing only C3 observations can still be satisfactory.
Homeowners may choose to complete C3 improvements during planned upgrades. Landlords and duty holders should understand the recommendation and consider the property's use and risk.
FI: Further investigation required
FI is used when the inspector has identified a concern but cannot determine safety within the agreed inspection without additional investigation. The follow-up should be carried out without undue delay.
FI is not a way to avoid inspection. The report should explain what requires investigation and why the available evidence was insufficient.
Why the description matters as much as the code
A useful EICR identifies the location, condition and reason for concern in language the recipient can understand. Photographs can help where the defect is visible. The classification should reflect the actual risk, not be used to sell unrelated upgrades.
Electrical Safety First's best-practice guidance emphasises that each observation should receive one appropriate classification and that the report is a factual record of condition, not a remedial quotation.
What happens after an unsatisfactory report
Obtain a clear scope for remedial work. After repairs, keep the appropriate certificates or written confirmation with the original EICR. The documents should show which observations were addressed and what testing was completed.
For rented property, statutory timescales and duties may apply. Use current government guidance and act promptly.
Frequently asked questions
Does a C3 mean the electrics have failed?
No. C3 is a recommendation for improvement and does not by itself make an EICR unsatisfactory.
Can an EICR have both C1 and C2 observations?
Yes. Each observation is classified separately according to the condition found.
Is FI the same as C2?
No. FI means more investigation is needed to determine safety. It still makes the overall outcome unsatisfactory until resolved.
Next step
Leon Electricians can explain EICR observations in plain language and provide a separate, evidence-based remedial scope where work is required. Call 020 3038 6072 or use the website enquiry form to discuss the property or premises.