The relevant clauses in NEC3 are 42.1 "Until the defects date, the supervisor may instruct the contractor to search for a Defect..." and 60.1(10) The supervisor instructs the contractor to search for a Defect and no Defect is found..."
The Supervisor should identify the Defect the contractor is to search for (it can't just be a general request) and the contractor is then obliged to do so.
The Supervisor should identify the Defect the contractor is to search for (it can't just be a general request) and the contractor is then obliged to do so.