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The four codes: C1, C2, C3 and FIC1 or C2. What's the one word between them?

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Four outcomes, and the difference between the first two is how fast, not whether.

CodeMeansActionReport outcome
C1Danger presentImmediate remedial actionUNSATISFACTORY
C2Potentially dangerousUrgent remedial action
C3Improvement recommendedNot dangerous; would improve safetySatisfactory, on its own
FIFurther investigation is advisedOnly in exceptional circumstancesSee below
A single C1 or C2 anywhere makes the whole report unsatisfactory

A C3 on its own does not. You can have a satisfactory report with several C3 observations on it.

these two make the report UNSATISFACTORY C1 danger present immediate action C2 potentially dangerous urgent action C3 does not FI: see section 28 C3 improvement recommended FI further investigation is advised One C1 or C2 anywhere → the whole report is unsatisfactory. A satisfactory report can still carry several C3s. The difference between C1 and C2 is how fast, not whether.
Four codes. Count the C1s and C2s first — any one of them makes the report unsatisfactory, and C3s on their own never do.

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