After the last wash yesterday the tub was dry. This morning there is water in the bottom of the washer tub.

Sounds like your water valve is not sealing closed and is slowly leaking into tub. Replace water valve.

make sure you drain lines are not plugged.

my old hitachi washing machine PAF-760P was not used for a long time.I started yesterday, it started washing but when the knob rotates and goes to drain the water,it only clicks and does not drain the water. What must be wrong with it. can you help please.

If it set for a long period of time, then the main tub seal may have gotten dried out. Storage is hard on items like seals and belts. It may swell some and seal itself with some use, but there is no guarantee that it will. Hope this helped.

You have a faulty fill valve

If you want to check which one, try turning off the cold supply only before you go to bed

If the washer has water in it next morning it is the hot valve that has gone faulty if it is dry then it is the cold one

They are easy to change and can be bought from a number of suppliers

just remove bolts, open bit enough to fill with silicone, close back wait to dry, ready to go for couple more years.

remove as much water as possible lean washer back against wall pump is on front of tub bottom pump twist locks into bottom of tub ..no tools needed pull release tab back and turn pump out and clean

Need to check drain pump and its hose connections. If its not from the drum seal then that's usually where the leaks occur.

Removing the lower front panel (3 screws nearest floor), and opening the round, white water pump filter cap (be ready to catch about 2 gallons of water!) is the best place to start. All you need is a Phillips head screwdriver and a large, flat pan (deep turkey tray works well)!

YOU WILL NOT BELIEVE what I found in my filter housing this morning (see photo below)!



The washer is working fine now, although I may go back and remove the entire water pump so it can be dismantled, thoroughly cleaned, and reinstalled.

It sounds like you have a faulty fill valve that is leaking by. The valve has an electric solenoid but also has a small diaphragm that needs to seat properly to keep the water supply from coming in. If the diaphragm is not seating correctly for whatever reason, water pressure alone can keep water filling into the wash tub. Even the smallest amount, over time can cause problems. One way to test the theory is to shut off the water supply before you go to bed. If the tub is still empty in the morning, more than likely you have a bad fill valve. Let me know if this helps.