The Contractor hasn’t corrected a Defect
Client side: Defects
Where the contract stands
Yes, if the Defect was notified and the Contractor was given access but did not correct it within the defect correction period. The Project Manager then assesses the cost of having other people do it, and the Contractor pays (46.1 in NEC4, 45.1 in NEC3). Get those conditions in place first, in that order.
Read the guide: Contractor won't correct a Defect
This is our plain-English summary, not legal advice. Your own contract, including any Z clauses, decides.
In Contract Status, step by step
Check the notice and the reply
The record holds the notification, the date, the Contractor's reply with the fault, cause and action, and any discussion.

D-0003: the promised action and date are on the record.
Record the correction by others
Further down the record, Mark as corrected by others closes the Defect with this record, and the amount the Contractor pays is shown on the final account.

The clause shown comes from the contract's clause list.
Keep the register honest
The Defects Register shows what is open and when each was replied to, and the contract page shows the open count on its tile.

Only the Client side closes a Defect.
All screens are from the upgraded app, using a fictional water company, Kestrel Valley Water, and its made-up contractors.
What happens next on the other side
The Contractor sees the Defect closed, and the sum appears on the final account. Contract health can date each Defect once the defect correction period is recorded for the contract.
See it on a contract you can click through
The guided tour lets you walk the same fictional account yourself. Or book a demo, and bring the situation you are dealing with.