What do the EICR classification codes actually mean?
Every observation on an EICR is given a code, and the codes are what decide whether the report passes or fails. C1 — 'Danger present' means there is a risk of injury right now; the electrician will make it safe immediately before leaving. C2 — 'Potentially dangerous' means the fault is not live-dangerous today but could become so, for example a missing earth on a circuit. FI — 'Further investigation required' means something could not be fully assessed and needs opening up. Any C1, C2 or FI makes the whole report Unsatisfactory, and remedial work must be completed within 28 days. C3 — 'Improvement recommended' does not fail the report; it flags something that met an older edition of the wiring regulations but would not be installed that way today. You are not legally required to act on a C3, though it is often sensible to.