This guide is for reading the codes in an EICR without turning them into guesswork. The aim is to
understand what the report is flagging, what may need attention first, and what should be checked before
any remedial scope is agreed.
Quick answer: C1, C2 and FI make a report unsatisfactory. C3 means improvement recommended and does not,
on its own, make the report unsatisfactory.
What the codes help decide
- What the report is actually flagging, in plain English rather than just the code label.
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Whether the next step is urgent safety action, further investigation, improvement work, or a calmer
planned repair.
- Which report pages, board photos or affected points would help confirm the sensible next step.
What can change the next step
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Hidden damage, poor previous work, unclear circuit details or access constraints can change the scope.
- The final outcome still depends on what is confirmed on site or in the report.
Official sources and further guidance