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Software faults become software failures only when they are "activated", that is, when a user tries to apply the specific software section that is faulty.

Software Quality Assurance (SQA)
Software, Software Quality and Software Quality Assurance
Software, from the SQA perspective, is the combination of computer
programs (the “code”), procedures, documentation, and data necessary for
operating the software system. The combination of all four components is
needed to assure the quality of the development process as well as the
ensuing long years of maintenance.
Software quality (SQ) is the degree of conformance to specific
functional requirements, specified software quality standards, and Good
Software Engineering Practices (GSEP).
Software quality assurance (SQA) is the systematic, planned set of
actions necessary to provide adequate confidence that a software
development or maintenance process conforms to established functional
technical requirements as well as the managerial requirements of keeping to
schedules and operating within the budget.
Software Errors, Software Faults and Software Failures
 Software errors are sections of the code that are partially or totally
incorrect as a result of a grammatical, logical or other mistake made
by a systems analyst, a programmer, or another member of the
software development team.
Software Quality Assurance Atica Altaie
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 Software faults are software errors that cause the incorrect functioning
of the software during a specific application. So, a fault found only
after the software has been released to end users.
 Software faults become software failures only when they are
“activated”, that is, when a user tries to apply the specific software
section that is faulty. Thus, the root of any software failure is a
software error.