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What is EICR observation codes?
Last verified 31 October 2026
EICR observation codes are the short labels an electrician gives each problem found during an Electrical Installation Condition Report. The codes are C1, C2, C3 and FI, and they decide whether the report is satisfactory and what you must do next.
Why it matters to landlords
C1 means danger is present, with a risk of injury. C2 means potentially dangerous, and a C2 makes the report unsatisfactory for continued use. FI means further investigation is needed without delay. C3 means an improvement is recommended: you do not have to act on a C3 for the report to count as satisfactory, although doing so improves safety. Do not treat a C3 as an instruction, but do read it.
In England, remedial or investigative work for a C1, C2 or FI must be finished within 28 days, or sooner if the report sets a shorter period. Within 28 days of completion, give your tenant and the local council the report plus written confirmation of the work from the person who did it. A satisfactory EICR, an Electrical Installation Certificate or a Minor Works Certificate all count. If you cannot finish in time, keep a record of every reasonable step you took. Check the rules separately if you let in Wales, Scotland or Northern Ireland.
Example
Priya has an EICR dated 3 March 2027 that lists one C2 (no RCD protection on the kitchen circuit) and two C3s. The report is unsatisfactory, so she books an electrician, who fits the RCD on 20 March. She sends the tenant and the council the report and his written confirmation on 25 March, inside the 28 days. The two C3s she can schedule at her next visit.
EICR Requirements for Landlords →
Related terms
- EICR (Electrical Installation Condition Report)
- Electrical Safety Standards Regulations
- Category 1 hazard
- Improvement notice