Errors, in the OP's own work, rather than faults created subsequently by other trades. Nowt much the OP can do about those, and such faults can appear any time, from straight away, to even years later.
Indeed, I was called to a fault on a socket circuit I installed in 2002, checked the outside sockets first, all dry, traced the fault to the conservatory, and found a live conductor shorting to a fixing screw, took 20+ years to wear through
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