EICR Codes Explained
If you have just received an EICR and you are staring at codes like C1, C2, C3 or FI, you are not alone. The codes are designed to make electrical safety clear and consistent. The problem is that they often feel technical when you are reading them for the first time.
This guide explains what each code means, why it matters, and what to do next. You will be able to read your report with confidence, without guessing how serious something is.
Understanding EICR Codes and Their Purpose
What are EICR codes?
EICR codes are a way of grading electrical issues found during an Electrical Installation Condition Report. They help the electrician communicate risk in a simple, standard format. They also help you understand what needs urgent action, what needs prompt attention, and what can be improved over time.
Why the codes matter
The codes matter for three reasons.
First, safety. They identify risks that could lead to electric shock, overheating, or fire.
Second, clarity. They give a consistent way to describe severity, so you are not relying on vague language.
Third, compliance. If you are a landlord or managing a property for others, the codes help show what must be put right and when to meet your legal duties.
The EICR Coding System Explained
During an inspection, an electrician will look at the condition of the fixed electrics. They will test circuits and protective devices. They will then record observations and assign a code based on the level of risk.
The core EICR codes are:
- C1 Immediate danger
- C2 Potentially dangerous
- C3 Improvement recommended
- FI Further investigation required
The key thing to understand is that the code is not a judgment of your property as a whole. It is a way of prioritising action.
Regulations and Standards Behind EICR Codes
EICR coding is tied to the UK wiring standards and how electrical installations are expected to perform safely. If you rent out a property, EICR results are also linked to compliance expectations, including when repairs must be carried out and how quickly they should be addressed. Even if you are not a landlord, these standards still matter because they influence what insurers, buyers, and conveyancers may ask about when you sell or renovate.
Why EICR Codes Improve Safety
Electrical risks are often silent. Many faults do not show themselves until a circuit is under load or a connection becomes hot. EICR codes help prevent that by flagging hazards early and turning them into a clear action plan.
They also reduce confusion. Instead of trying to interpret a long technical comment, you can focus on the code and what it means for the next steps.
What Each EICR Code Means
Code C1 Immediate danger
C1 means there is a real and present danger. Something has been found that could cause harm straight away.
Examples can include exposed live parts, severe overheating risk, or electrical defects that make electric shock more likely. In some cases, an electrician may make the situation safe during the visit, such as isolating a circuit.
What it means for you:
- Do not ignore it
- Arrange repairs immediately
- If it is in a rented property, act quickly and keep evidence of what was done
If C1 items are left unresolved, you risk injury, and you increase the chance of electrical fire.
Code C2 Potentially dangerous
C2 means something is not immediately dangerous in that moment, but it could become dangerous under the right conditions. It still needs urgent attention.
Common examples include inadequate earthing, faulty protection devices, or issues that increase the risk of shock if a fault occurs.
What it means for you:
- Treat it as a priority, not a future task
- Book remedial work as soon as possible
- If you are selling or renting, expect it to affect negotiations or compliance requirements
Delaying C2 repairs can create risk over time, especially as systems age or usage changes.
Code C3 Improvement recommended
C3 means the installation is not unsafe, but improvements are recommended. These are often about bringing parts of the system closer to modern expectations.
This could include older equipment that still works safely but does not provide the same protection you would expect in a newer installation.
What it means for you:
- You do not usually need to fix it immediately for safety
- It is still worth budgeting for overtime
- Addressing C3 items can improve future reliability and reduce the chance of bigger issues later
C3 is not a failure code by itself. It is a signal for long-term improvement.
Code FI: Further investigation required
FI means the electrician could not confirm whether something is safe without additional investigation.
This may happen when testing is incomplete, when results are unclear, or when parts of the installation cannot be accessed safely.
What it means for you:
- You still need action, because safety is not confirmed
- Book a follow-up investigation quickly
- Do not assume it is minor just because it is not labelled C1 or C2
FI is a pause point, not an all clear.
Observations in an EICR Report
An EICR includes observations, the code for each observation, and often a short explanation of the issue.
A helpful way to read your report is to separate two things:
- Defects that require repair or investigation
- Improvements that reduce long term risk but are not urgent
The codes do that work for you.
Practical Implications of EICR Codes
Will a report be classed as satisfactory or unsatisfactory?
In general, a report is marked unsatisfactory if it includes:
- C1
- C2
- FI
C3 items alone do not usually make a report unsatisfactory.
How to prioritise actions
If you want a simple order of action:
- Fix C1 items immediately
- Fix C2 items as soon as possible
- Resolve FI items quickly, because safety is not confirmed
- Plan C3 improvements sensibly over time
This is the simplest way to turn a report into a clear plan.
Common Findings and Typical Codes
People often see patterns in EICR results, especially in older properties. While every home is different, these are the kinds of issues that can appear across reports:
- Protection issues, such as missing or outdated safety devices
- Earthing and bonding concerns
- Signs of wear or heat at connections
- DIY alterations that do not meet expected standards
The code tells you how serious the finding is in the context of safety.
What Happens During Testing
EICRs combine inspection and testing. This can include checks on insulation resistance, earth fault loop impedance, and protective devices such as RCDs. Those results influence which codes are assigned.
A good electrician will explain what they found in plain English. If anything feels unclear, it is reasonable to ask what risk the code represents in everyday terms.
What to Do After You Receive an EICR
Start with three steps.
Step 1: Read the summary page and list the coded observations.
Step 2: If there are C1, C2, or FI items, arrange for a qualified electrician to complete repairs or investigation.
Step 3: Keep your documentation. Save the EICR, invoices, and any certificates for remedial work. This matters for landlords, but it also helps when selling, refinancing, or insuring a property.
Keeping Your Property Safe Long Term
Electrical safety is not a one-time event. Systems change, loads increase, and minor defects can become bigger ones.
Regular inspections, sensible upgrades, and acting quickly on coded findings are what keep a home safe, compliant where needed, and easier to sell when the time comes.
FAQs
What do EICR codes mean?
EICR codes grade electrical issues by risk level. They show what is dangerous now, what could become dangerous, what is recommended to improve, and what needs more investigation.
What is the difference between C1 and C2 on an EICR?
C1 means immediate danger and needs urgent action. C2 means potentially dangerous and should be repaired quickly to prevent risk from developing or escalating.
Does a C3 fail an EICR?
No. C3 means improvement recommended. It does not usually make a report unsatisfactory on its own.
What does FI mean on an EICR?
FI means further investigation is required. It indicates the electrician could not confirm safety without additional checks, so follow up is needed.
What makes an EICR unsatisfactory?
A report is typically classed as unsatisfactory if it contains C1, C2, or FI observations.
