Zero breakdown is a maintenance philosophy and operational objective aimed at eliminating unexpected failures of equipment, machinery, or building services. In the context of building services and maintenance, zero breakdown refers to ensuring that all systems—electrical, mechanical, plumbing, HVAC, elevators, fire safety, and other critical infrastructure—operate continuously without sudden malfunctions that disrupt building functionality or compromise safety. The concept is not limited to reactive repair but emphasizes a proactive, systematic approach that integrates preventive measures, condition monitoring, and effective resource management to achieve uninterrupted service. Zero breakdown is essential in modern buildings, especially commercial complexes, hospitals, data centers, and industrial facilities, where downtime can lead to financial losses, safety hazards, or inconvenience to occupants. Achieving zero breakdown requires a well-structured maintenance strategy and the active involvement of the maintenance department. The maintenance department plays a pivotal role in attaining this goal by implementing planned maintenance, monitoring performance, coordinating resources, and continuously improving processes. The department is responsible for establishing procedures, schedules, and systems that anticipate failures before they occur, ensuring that equipment is maintained in optimal condition, and aligning maintenance practices with the operational objectives of the building. The first key function of the maintenance department is to implement preventive maintenance. Preventive maintenance involves regular inspections, servicing, lubrication, calibration, cleaning, and replacement of components according to manufacturer recommendations and industry standards. For example, in HVAC systems, preventive maintenance includes cleaning coils, replacing filters, checking refrigerant levels, inspecting fans and motors, and testing control systems. In elevators, it involves inspecting cables, brakes, and safety mechanisms. By systematically carrying out preventive maintenance, the department reduces the likelihood of sudden breakdowns, extends equipment life, and ensures reliable operation. Preventive maintenance is often scheduled based on time intervals or operational hours, forming the foundation of the zero breakdown objective. Condition-based maintenance is another crucial approach facilitated by the maintenance department. This involves continuous monitoring of equipment performance using sensors, alarms, and automated diagnostic tools. For instance, vibration analysis on motors, thermal imaging for electrical panels, and pressure monitoring in plumbing systems allow early detection of anomalies. The maintenance team can then intervene before minor issues escalate into critical failures. This predictive approach reduces unexpected downtime, optimizes resource allocation, and supports the zero breakdown