This paper delves into the reliability modeling and availability analysis, examining the A-pan boiling system within the sugar industry as its focal point. The A-pan boiling system is composed of four repairable subsystems that operate in series. These four subsystems are pan subsystem, air-cooled crystallizer subsystem, centrifugal subsystem, and sugar grader subsystem. To develop a reliability model, a state transition diagram is constructed, considering the three states of the A-pan boiling system: full capacity, reduced capacity, and failed state. By utilizing Markov’s probabilistic approach and developing a state transition diagram, the study established a mathematical model for the availability of A-pan boiling system. The expression for steady-state availability and the examination of constant hazard and repair rates contribute to a more comprehensive grasp of the A-pan boiling system’s availability. The identification of the critical subsystem and maintenance priority order facilitates effective maintenance management and enhances the overall reliability of the system.