You either have a water inlet valve that is leaking by and filling the tub slowly overnight. Or, you may have a siphoning issue that is causing water to be back fed from the drain line. Here's how to determine:
Shut your water taps off when not in use and monitor for several days. If the tub remains dry, then you know you have a water SOURCE problem. If the water fills the tub with the water taps turned off, you have a DRAIN problem.
If you need to replace the water inlet valve, follow these steps:
1. Turn off the water taps and UNPLUG the washer.
2. Remove the water inlet hoses from the back of the washer.
3. Remove the top panel of the washer by removing the three screws that hold the panel in place in the rear of the washer. With the screws removed, the panel will slide back, then off.
4. The water inlet valve is located in the left rear of the washer (as viewed from the front). Remove the dispenser hoses from the inlet valve and the electrical connections.
5. Remove the mounting screws that hold the valve in place and it will come out of the machine.
6. Reinstall new valve in the reverse order of the steps I provided to you.
If you believe you may have a siphoning problem, the following link explains what siphoning is and how to correct it:
http://www.fixya.com/support/r587481-prevent_washer_siphoning
If you have any questions about any of the information I provided, or if you need assistance in locating parts, please let me know. I hope this helps you.
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