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Good morning! If you're certain that the washer is getting good pressure from the hot water line and the screen is clear of debris, your solenoid on your valve assembly is just restricting the flow and not opening all the way. Its a very common way for these vales to fail. Either way, you'll need to order and replace the dual solenoid valve which is the part that your water supply hoses connect to on the back of the washer. Below is a link to the part you'll need to order and replace.
CLICK HERE for valve
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