The 2 most common part(s) or condition(s) which cause the symptom Refrigerator ice and water dispenser not working are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 1268249
If the refrigerator ice and water dispenser is not working, the door switch might be defective. When the freezer door is opened the freezer door switch does two things, it turns on the light in the freezer and turns off the ice maker dispenser. If the door switch fails the dispenser will not turn on. The switch can be checked for continuity with an Ohm meter. If it doesn’t have continuity it should be replaced.
RepairClinic Item # 1522441
If the refrigerator ice and water dispenser is not working the main control board might be defective. This is not common. Normally, problems with the dispenser are related to components of the dispenser.