This is usually a symptom of a defective fill valve (also known as a mixing valve). Post back with your washer brand and model number, so I may be able to give advice on where to obtain a replacement part and/or how to repair.
Some other causes of water leaking by can be attributed to the fill valve being dirty with sediment or the water pressure being too low at the tap (should be a minimum of 10-25 psi).
If you've never had a problem with water pressure before, you may be able to rule that issue out fairly easily. If the fill valve is dirty with sediment, you can remove it and attempt to flush the valve out along with the sediment screens. I would still need a brand name and model number in order to give the correct advice on how to disassemble. I hope this helps you.
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