Sub Zero Refrigerator Ice And Water Dispenser Not Working – How to fix? by HoustonAuthorizedRepair.com 

The part(s) or condition(s) listed below for the symptom Refrigerator not cooling are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Refrigerator Ice And Water Dispenser Not Working

Cause 1 Dispenser Control Board
The dispenser control board governs most of the functions of the dispenser system. If only one dispenser part is not working, it is probable that an individual part has failed. In this case, test each of the dispenser components before testing the control board. If the entire dispenser system is not working, the control board is more likely to be at fault.
Cause 2 Dispenser Switch
The dispenser switches send voltage to the dispenser. If one of the dispenser switches is defective, the dispenser will not work. To determine if a dispenser switch is defective, use a multimeter to test each switch for continuity. If a dispenser switch does not have continuity, replace it.
Cause 3 Door Switch
The door switch turns off the ice and water dispenser when the refrigerator door is open. If the door switch fails, the dispenser will not turn on. To determine if the door switch is defective, use a multimeter to test it for continuity. If the door switch does not have continuity when activated, replace it.
Cause 4 Main Control Board
The main control board might be defective. However, the control board is rarely at fault for this problem. Before replacing the control board, first check all of the dispenser components. If none of the dispenser components are defective, consider replacing the main control board.
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