C1, C2, C3 and FI faults explained for London landlords, homeowners, letting agents, and businesses.
If your EICR report shows codes such as C1, C2, C3 or FI, this guide helps you quickly understand what they mean, whether they can make the report unsatisfactory, and what remedial work may be needed.
Use the search tool below to type the wording from your EICR report, such as no RCD protection, high Ze, bonding missing, broken socket, bathroom light issue or further investigation required.
For the fastest remedial quote, send your failed EICR certificate and a clear photo of the fuse board on WhatsApp.
Type a code, keyword or observation from your EICR report. Select the closest match to understand the fault, whether it may affect the certificate result, and what remedial work may be needed.
Popular: C1, C2, FI, no RCD, high Ze, gas bonding, consumer unit, exposed wires, broken socket.
Search for an EICR code or observation from your report. When you select a result, the explanation will appear here with the likely code, what it means, how it may affect the certificate, a related guide and a fast remedial work quote option.
Need a quote quickly? Send your failed EICR certificate and a clear photo of the fuse board on WhatsApp.
Send Failed EICR on WhatsAppThese FAQs explain the most common EICR codes, including C1, C2, C3 and FI, and what London landlords, homeowners and businesses should do if their electrical report is unsatisfactory.
C1 means danger is present and urgent action is normally needed. C2 means potentially dangerous and usually makes the EICR unsatisfactory. C3 means improvement is recommended but it does not normally fail the report by itself. FI means further investigation is required before the electrician can confirm whether the installation is safe.
Yes, in most cases a C2 observation means the EICR is unsatisfactory. The issue is considered potentially dangerous, so remedial work is normally required before the report can be treated as satisfactory.
A C3 code does not normally fail an EICR certificate on its own. It means improvement is recommended, usually because the installation does not meet current best practice. However, it should still be reviewed, especially if several C3 observations appear on the report.
FI means further investigation. The electrician has found something that needs more testing, access or fault tracing before a safe conclusion can be made. FI observations often make the EICR unsatisfactory until the investigation is completed.
Not always. No RCD protection can be coded as C2 or C3 depending on the circuit, location and risk. It is more likely to be C2 for socket circuits, bathroom circuits, concealed cables or areas where additional protection is required for safety.
An old fuse board is not automatically a fail. The electrician will consider its condition, whether live parts are exposed, whether RCD protection is missing, whether circuits are correctly protected and whether the board is safe for continued use.
If your EICR is unsatisfactory, you should review the observations, identify any C1, C2 or FI items, and arrange remedial work with a qualified electrician. For a faster quote, send the failed EICR report and a clear photo of the fuse board.
If the report is unsatisfactory, the landlord will usually need to arrange remedial work and keep written confirmation that the required work has been completed. The exact obligation depends on the report findings and the property situation.
The cost depends on the fault, access, consumer unit condition, circuit layout and materials required. Small fixes such as sockets or blanking plates may be lower cost, while consumer unit upgrades, bonding work or fault tracing can cost more.
Send the failed EICR certificate, any photos provided by the engineer, a clear image of the fuse board and the property address. This helps the electrician understand the issue and provide a more accurate remedial work quote.
Send your failed EICR certificate and fuse board photo on WhatsApp for a remedial quote.
