When you receive your Electrical Installation Condition Report (EICR), the most important part to check is the list of observations — often labelled C1, C2, C3, or FI. But what do these codes actually mean, and what action is required?
This guide explains each classification code so you can understand whether your report is satisfactory, needs follow-up work, or requires urgent action.
New to EICRs? Start with What is an EICR and Why Landlords Must Care in 2025.
C1 – Danger Present
C1 (Code 1) means there is an immediate danger present in the electrical installation. This could lead to electric shock or fire. A C1 fault requires urgent action — and the electrician may shut off the circuit immediately to protect occupants.
- Example: Exposed live wiring, broken sockets showing metal contacts
- Action: Immediate disconnection and remedial work
- EICR Result: Automatically marked as unsatisfactory
C2 – Potentially Dangerous
C2 (Code 2) indicates a potentially dangerous situation that may not be an immediate threat, but could become hazardous if not corrected.
- Example: Missing RCD protection, lack of earthing, broken fittings
- Action: Remedial work required within 28 days
- EICR Result: Marked as unsatisfactory until resolved
FI – Further Investigation Required
FI means the inspector found an issue that could not be fully tested or understood at the time, and more detailed investigation is required to confirm whether the system is safe or not.
- Example: Hidden junction boxes, unidentified cables, inaccessible areas
- Action: Arrange further inspection ASAP
- EICR Result: Report is unsatisfactory until FI is resolved
What About C3?
C3 (Code 3) means “Improvement Recommended.” This does not make your EICR unsatisfactory, but upgrading the installation would bring it closer to current standards.
- Example: Outdated consumer unit, minor non-compliant labelling
- Action: Optional, but advisable
- EICR Result: Report can still be marked satisfactory
Summary Table
| Code | Meaning | Action | Report Status |
|---|---|---|---|
| C1 | Danger present | Immediate disconnection & repair | Unsatisfactory |
| C2 | Potential danger | Repair within 28 days | Unsatisfactory |
| FI | Further investigation needed | Investigate ASAP | Unsatisfactory |
| C3 | Improvement recommended | Optional | Satisfactory |
What If I Have a C1, C2 or FI on My Report?
You’re legally required to fix C1 and C2 faults, and carry out any necessary investigations for FI. These should be resolved within 28 days — or sooner, depending on the recommendation.
Once fixed, you must get a written confirmation (usually called a “satisfactory completion note” or minor works certificate), which should be kept alongside the EICR.
Read more in our next article: Failed Your EICR? Here’s What Happens Next.
Need Help Interpreting Your Report?
We’re here to help. CIR Electrical offers post-EICR advice and remedial works at fair, transparent prices. We can re-inspect your property once corrections are made and issue an updated compliance certificate.
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