GE Appliances · Washer and Dryer GUV27 and GUD24 Series
The sound changes during fill because the Automatic Temperature Control Valve is mixing hot and cold water. This is normal operation to reach the selected wash 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