What Is an FI Code on an EICR?
FI – Further Investigation
EICR Code FI stands for “Further Investigation”. It is used when an electrician identifies a potential issue but cannot confirm whether it is dangerous without carrying out additional testing.
Sometimes mistakenly referred to as “F1”, the correct classification is FI.
FI observations indicate that more investigation is needed to determine whether a fault exists and if it poses a risk. Until this is resolved, the condition of the installation cannot be fully confirmed.
An FI code will usually result in an unsatisfactory EICR, as the installation cannot be confirmed as safe until further investigation has been completed.
For professional assistance, see our EICR inspection service.
Common examples of FI observations include:
Inspection Limitations
• Parts of the installation not accessible (e.g. behind walls, under floors, or in loft spaces)
• Equipment that could not be safely isolated or fully tested
Testing Irregularities
• Test results outside expected values
• Inconsistent or unexpected readings during testing
Identification Issues
• Unidentified circuits
• Missing or unclear circuit labelling preventing full assessment
Potential Hidden Issues
• Suspected damage to cables or connections not visible during inspection
• Signs of previous alterations where full verification isn’t possible
What Happens Next?
Important Note
⚡ An FI observation does not confirm a fault, but it does mean further investigation is required before the installation can be considered safe. The issue must be investigated before the condition of the installation can be fully assessed. This should be carried out by a qualified electrician to identify and resolve any underlying issues. See our EICR inspection service for professional assistance.
Why Choose RW Currion for Your Electrical Work?
• Fully qualified and insured
• Clear explanations — no jargon
• Work completed to the latest BS 7671 standards
• Safety-first approach to protect your home, family, and electronics
• All installations come with full certification and are emailed for your records.
Honest advice on any electrical work required
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