Water just up & quit dispensing one afternoon. Worked earlier in the day. Ice maker still makes & dispenses ice. When pushing the pad on the door front to dispense water all I hear is a clicking noise coming from the back underneath side of refrigerator. After doing some investigating on the web, it sounds like it could be the "Smart Valve" part #2305225. Before spending $80 on this part I wanted to get your opinion of what the problem might be. Whirlpool’s customer service wasn’t any help. Can you help? 