What is a preventive maintenance program, and which indicators signal when equipment needs servicing?

• A. A systematic schedule of inspections, cleaning, and parts replacement; indicators: unusual noises, temperature fluctuations, frequent tripping breakers, increased energy use, inconsistent outputs.
• B. A maintenance plan only for decorative equipment.
• C. Maintenance is only needed after a breakdown.
• D. There are no indicators.

Answer: (A)