What icon appears when maintenance is required for the unit?

The correct icon indicating that maintenance is required for the unit is the "MAINTENANCE" icon. This specific icon is designed to alert users that the SCBA requires attention or servicing to ensure it operates correctly and safely. The maintenance icon is particularly important as it helps users identify that routine checks or repairs need to be performed, which is critical for the functionality and reliability of the breathing apparatus.

Identifying maintenance needs through this icon allows users to take proactive measures, ensuring the equipment remains in optimal condition and can effectively respond to hazardous situations. Awareness of the maintenance requirements is essential for upholding safety standards and prolonging the life of the SCBA.