Getting an Electrical Installation Condition Report (EICR) is a smart way to check the safety of your wiring, but the codes on the report can look confusing at first glance. Understanding C1, C2, C3 and FI helps you decide what to do next without unnecessary worry.
How EICR coding works
During an EICR, an electrician checks the condition of your fixed wiring, consumer unit, sockets, lights and protective devices. Any issues are given a code to show their impact on safety.
The key thing to remember is that the EICR is there to highlight risk levels, not to scare you into a full rewire. Each code simply tells you how serious a problem is and how quickly it should be addressed.
C1: Immediate danger, someone could be injured now
C2: Potentially dangerous, could become unsafe
C3: Not unsafe, but improvement is recommended
FI: Further investigation needed before a decision
C1: immediate danger and urgent action
A C1 code means there is an immediate risk of electric shock, fire, or injury. The electrician should make the situation safe straight away, usually by disconnecting or isolating the affected part of the installation.
Typical C1 examples include exposed live parts you could touch, bare wires visible from a damaged accessory, or a metal light fitting that has become live. In these situations, the danger is present now rather than just a possibility.
Although this sounds serious, a C1 is often localised. For example, it might be limited to one broken socket, one damaged light fitting, or a section of overheated cable. Once made safe and repaired, that area can usually be retested without needing major work elsewhere.
C2: potentially dangerous and needs prompt attention
A C2 code means something is not safe enough and could lead to danger under fault conditions. It is not usually an emergency that requires your power to be cut off completely, but it does need sorting in good time.
Common C2 examples include:
No earthing or very poor earthing to key circuits or metal pipework
Damaged accessories that are not yet live, but could become so
Incorrect or missing protective devices for the size of cable
No RCD protection where it is needed for safety, such as certain socket circuits or bathrooms
A C2 will usually mean the overall EICR outcome is classed as “unsatisfactory” until those issues are resolved. That does not automatically mean a full rewire. Often targeted remedial work, such as upgrading the consumer unit, adding RCDs or repairing specific circuits, is enough.
C3: improvement recommended, not unsafe
A C3 code is for items that do not meet current standards but are not considered unsafe in their present condition. You are being advised that your installation could be safer or more up to date, but there is no immediate or likely danger.
Typical C3 examples include lack of labelling on circuits, older but intact wiring that still tests satisfactorily, or plastic consumer units that are in good condition but do not offer the latest fire containment features.
A report with only C3 codes can still be classed as “satisfactory”. Landlords and homeowners should treat C3 items as a sensible improvement list rather than a list of faults.
FI: when further investigation is needed
The FI code is used when the electrician has seen signs of a possible problem but cannot fully assess it during the initial inspection. More detailed testing or access is needed before deciding whether it is safe.
Examples include insulation readings that look unusual, cables disappearing into areas that cannot be safely accessed, or signs of overheating that require parts to be dismantled. FI items should be followed up relatively promptly, as the installation cannot be fully assessed until they are resolved.
How urgent are EICR codes?
Think of urgency in terms of risk levels rather than fixed timescales. C1 issues are urgent and should be made safe immediately. This usually happens during the inspection itself.
C2 and FI items are the next priority. They should be planned in as remedial work or further investigation without delay, especially in rented homes where landlords have a clear duty to maintain safe electrics.
C3 items are advisory. They are best tackled as part of future upgrades, refurbishments, or when carrying out other electrical work, rather than needing instant action.
Typical remedial work and re-testing
After you receive your EICR, your electrician can provide a list of recommended remedial works. This might include replacing damaged sockets, upgrading bonding to gas and water pipes, or adding missing RCD protection.
In many properties, safety can be significantly improved by upgrading the consumer unit so it provides modern RCD or RCBO protection. This is particularly relevant where several C2 or C3 items relate to missing or inadequate protection.
Once remedial work is complete, the electrician will usually re-test the affected circuits. You may receive an updated EICR or an electrical installation minor works certificate, depending on what has been done. Landlords should ensure the documentation clearly shows that previously coded issues have been addressed.
Myth-busting: EICR codes put in perspective
It is easy to feel overwhelmed when you see several codes on your report. In reality, many concerns arise from misunderstandings rather than the actual condition of the wiring.
C3 is not a fail: a report can still be satisfactory with C3 items. They are recommendations for improvement, not signs that your home is unsafe.
Not every C2 means a rewire: many C2 issues can be resolved by repairing or upgrading specific parts of the installation, such as earthing, bonding, or a small section of damaged cable.
Consumer unit upgrades are often practical: where multiple codes relate to missing RCDs or outdated protection, a new consumer unit can be an efficient way to bring your system up to modern safety standards.
What landlords should keep on file
For landlords, good record keeping is just as important as the inspection itself. Always keep a copy of the latest EICR, along with any previous reports for reference. This helps show the history of the installation and any improvements over time.
File all certificates for remedial work, such as installation certificates, minor works certificates and any updated EICRs. Keep evidence of communication with tenants about access and completed works, as this helps demonstrate you have taken electrical safety seriously.
Next steps if you are unsure about your report
If you are in or around Knebworth and have received an EICR that you do not fully understand, speaking directly to a qualified electrician can make everything much clearer. A short conversation can help you prioritise what genuinely needs attention and what can wait as a future upgrade.
D C Electrix Ltd can carry out EICRs, explain your report in plain language, and provide a sensible plan for any remedial work, including options such as a new EICR certificate or a consumer unit replacement where appropriate. To book an inspection or discuss your existing report, call 07415049613 and speak to D C Electrix Ltd today.
