Step1: Disconnect electrical power and shut off the water supply to the unit before starting.
Step2: Remove the access panel to locate the existing solenoid valve assembly.
Step3: Label and disconnect the electrical coil wires and inlet/outlet water lines.
Step4: Unthread and remove the old valve, ensuring seals and fittings are clean.
Step5: Install the new valve, aligning connections and tightening securely without overtightening.
Step6: Reconnect wiring, restore water and power, then test for leaks and proper fill operation.