Quick answer
C2 means potentially dangerous — the fault could cause harm under certain conditions. It must be fixed within 28 days and the EICR is classed as unsatisfactory until it is.
A C2 code on your EICR means the electrician found something potentially dangerous that needs to be fixed urgently. It is not an immediate danger (that would be C1) but it could become one. Common C2 findings include missing RCD protection, damaged cable insulation, inadequate earthing, or a plastic consumer unit that is a fire risk. Your EICR will be classed as Unsatisfactory until the C2 is fixed. For landlords, C2 items must be remedied within 28 days and written confirmation provided to the tenant and local authority. For homeowners, you should arrange the remedial work promptly. Once fixed, you will receive a Minor Works Certificate or a new EICR confirming the issue is resolved.
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