EICR Codes Explained: What Do C1, C2, C3, and FI Mean?

You’ve just received your Electrical Installation Condition Report (EICR) back from your electrician. Instead of a straightforward "Pass," the document is stamped "Unsatisfactory" and is filled with cryptic jargon like C1, C2, C3, and FI. What does it all mean, and more importantly, can you still legally rent out the property?

Understanding these classification codes is not just about translating electrician jargon. Under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020, how you react to these codes dictates whether you are a legally compliant landlord or whether you are about to face a colossal local authority fine.

Here is the definitive guide to decoding your EICR, what each code means for the safety of your property, and the strict legal deadlines you now face to fix them.

Decoding the EICR Classifications

During the inspection, the electrician compares your installation against the national safety standard (BS 7671). When they find an issue, they assign it a code based on the severity of the danger. If your report contains a C1, C2, or FI code, the overall outcome will automatically be graded as "Unsatisfactory."

Code C1: Danger Present

This is the most severe code possible. A C1 classification means there is an immediate threat to life. It indicates that a person could easily touch a live electrical component, risking fatal electric shock or causing an immediate fire hazard.

• Examples: Exposed live wiring hanging from a broken light socket; conductive parts of a consumer unit that can be touched without a tool; severe heat damage or burning around a plug socket.
• Action Required: Immediate. In many cases, the electrician is duty-bound to make the circuit safe before they even leave the property (often by disconnecting the affected circuit entirely).

Code C2: Potentially Dangerous

While a C1 means danger is present right now, a C2 means the setup is potentially dangerous in the event of a fault. The installation might seem to be working fine, but if a surge or fault occurs, the safety mechanisms will fail, leading to electric shock or fire.

• Examples: No RCD (Residual Current Device) protection on sockets used for outdoor equipment; an absence of reliable earthing on metallic pipes or the gas meter; significantly overloaded circuits.
• Action Required: Urgent remedial action is required to bring the installation up to a safe standard.

Code FI: Further Investigation Required

This code means the inspector has found something highly suspicious but could not fully diagnose the issue during the standard time allotted for the EICR. Crucially, an FI code means the electrician suspects a C1 or C2 fault is hiding just out of sight.

• Examples: Unverified circuits on the consumer unit that could not be traced; suspected damage to wiring hidden within a wall cavity or under floorboards.
• Action Required: You must authorise the electrician to conduct a deeper investigation to determine if the fault is dangerous. Because it might be dangerous, an FI code fails the entire EICR.

Code C3: Improvement Recommended

A C3 code is the only observation that does not cause an EICR to fail. It means the installation is technically safe and complies with older regulations, but it does not meet the latest BS 7671 safety standards.

• Examples: Older style wiring colours; a lack of a warning label on the fuse box; minor physical damage to a socket that does not expose live parts.
• Action Required: None legally. While upgrading is recommended to improve the overall safety of the property, a report with only C3 codes will be graded as "Satisfactory."

What Happens Next?

If you have an "Unsatisfactory" report, you cannot legally rent the property to a new tenant until the C1, C2, and FI faults are rectified. You do not necessarily need a whole new EICR; you just need an invoice and an Electrical Installation Certificate (EIC) or Minor Electrical Installation Works Certificate (MEIWC) from the electrician proving the specific faults have been fixed.

If you need urgent remedial works completed to satisfy an "Unsatisfactory" EICR, or if you need a brand new assessment from a trusted, accredited professional, use our priority quote form below.