GE Appliances · Washer and Dryer GUV27 and GUD24 Series
This clicking sound comes from the Automatic Temperature Control Valve, which mixes hot and cold water. The sound indicates the valve is turning on and off to achieve the selected temperature.
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This is a normal operational sound and does not require any user action.
Refer to the online video guide for normal washer sounds if concerned: http://products.geappliances.com/appliance/gea-support-search-content?contentid=23061