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.
RW Currion Electrical can help with EICR testing, urgent electrical fault finding and remedial work across Banbury and nearby villages.
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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, using appropriate fault finding and repairs to identify and resolve any underlying issues. See our EICR inspection service for professional assistance.
Other classifications are explained in our EICR code pages. EICR Code C1 (danger present), EICR Code C2 (potentially dangerous) and EICR Code C3 (improvement recommended).
Need an Honest, Professional EICR in Banbury or the Surrounding Areas?
If you need an honest, professional EICR carried out in Banbury or the surrounding areas, RW Currion Electrical can help with landlord, homeowner, home buyer and small commercial electrical safety checks.
Richard provides clear reports, practical advice and can explain any C1, C2, C3 or FI observations found during the inspection.
Visit the EICR Banbury service page to arrange an Electrical Installation Condition Report.
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, straightforward advice on any electrical work from your local electrician in Banbury
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