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At Multitech Institute, students learn how the PCB board controls water inlet and drain operations in fully automatic and semi-automatic machines. 🔹 Topics Covered in Practical Class: Water Inlet Valve – How PCB signals the solenoid to allow water. Drain Valve Working – How the drain motor functions via PCB signal. Sensor Input Reading – How level sensors communicate with the PCB. Relay & Triac Functions – Control flow of current to valves. Fault Diagnosis – Checking if the issue is with the va