Operating water solenoid valve malfunctioning. Causes and remedy 1. Control unit is defective. Action: contactact service backup support. 2. Wire break in the connecting terminal. Action: Replace wire. 3. Connecting terminal on the connector block is loose. Action: tighten the screw of terminal. 4. Coupler socket loose. Action l: tighten coupler socket. 5. Magnetic coil defective. Action: Replace the solenoid head. 6. Diaphragm defective. Action: Replace diaphragm.