Final answer:
A Gas Technician must report an unapproved appliance to the appropriate authority and treat it as an unacceptable condition, not attempt to fix it or leave it as is, ensuring safety regulations are followed.
Step-by-step explanation:
If a Gas Technician finds an appliance that is not approved, the correct course of action would be to report it to the appropriate authority. This would typically mean following local regulations which may involve notifying the gas utility, the building department, or other regulatory body tasked with overseeing gas safety. Attempting to fix the appliance without proper approval or leaving it in operation could be dangerous and is generally against safety regulations. As such, the technician must treat it as an unacceptable condition and take the necessary steps to ensure the safety of building occupants and property.