Code explanation
EICR FI Code: Further Investigation
An FI on an EICR means further investigation is required without delay because a potential issue could not be fully assessed during the inspection.
An FI code means "Further investigation required without delay". It is used when the inspector has found something that could be a problem but which cannot be fully assessed or classified during the inspection itself.
Why an FI is recorded
An FI is appropriate when a result or observation is inconclusive — for example an unexpected test reading, or a concern that needs the circuit to be opened up or investigated further to establish the cause.
What must happen
- Arrange prompt further investigation by a competent person.
- An FI makes the report Unsatisfactory until the matter is resolved.
- The investigation may conclude that the item is fine, or it may reveal a defect requiring a C1 or C2 remedy.
Handling FI items well
Do not leave FI observations open. They represent unresolved risk. For a practical approach to closing them out, see handling FI observations.
Frequently asked questions
Does an FI make a report Unsatisfactory?
Yes. An FI (further investigation required without delay) results in an Unsatisfactory outcome, because a potential safety issue remains unresolved until it has been investigated.
Related service
Electrical Fault Finding
Systematic diagnosis of electrical faults across circuits and equipment.
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Code explanation
EICR C1 Code: Danger Present
A C1 on an EICR means danger is present and a risk of injury exists. It requires immediate action and always makes a report Unsatisfactory.
Learn moreComparison
Difference Between C1 and C2 on an EICR
C1 means danger is present now and requires immediate action; C2 means potentially dangerous — safe now but a fault could make it dangerous. Both fail an EICR.
Learn moreCode explanation
EICR C2 Code: Potentially Dangerous
A C2 on an EICR means potentially dangerous — no immediate danger, but a fault could make it dangerous. It requires urgent remedial action and fails the report.
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Difference Between C2 and C3 on an EICR
C2 is potentially dangerous and fails an EICR, requiring urgent remedial work; C3 is a non-urgent improvement recommendation that keeps the report Satisfactory.
Learn moreThis article provides general guidance and distinguishes legislation, British Standards and good practice. It is not legal advice. Always confirm the specific duties applying to your property and tenure.