How to get WTW5640XWO whirlpool washer into diagnostic mode

Don't be too sure the drive coupler hasn't failed or is failing

What is the complete model number of your unit?

probably you've got something blocking the water pump from doing its job properly so check that the water pump is free running emptying all the water if not then there is a blockage in the pump normally ist a button, paper clip or other debris out of a trouser pocket eric

see the next steps and use the common sense: God bless you
When the cycle doesn't advance, it's probably the timer or a cold-water supply problem: It's the timer, if your washing machine fills with water and begins agitating, but the timer never advances--or if the washer is in a spin cycle and the timer won't advance. Then you need to replace the timer. It may be a cold-water supply problem, if the washing machine fills with water, agitates, drains, and spins, but then doesn't fill with rinse water. See There's no cold water.

see this cause:
It spins, but doesn't pump
drain line clogged, +remove some sock with pliers maybe you can remove the agitator+pumps propeller defective.
It doesn't spin or pump
frozen pulley pump, replace the pump
It pumps, but the water returns
improve the drain line+if the drain line reach more 4 inches, cut of the excess. if is lower,install air/gap siphon break assembly.

God bless you

see this causes:
t spins, but doesn't pump
the drain line is clogged+ some sock remain, remove with pliers,+pump defective.
It doesn't spin or pump
frozen pulley pump defective, replace
It pumps, but the water returns
improve the drain line. If drain hose reach more 4 inche cut of of excess. If lower add air/gap siphon break assembly.
see diagram
God bless you

see this cause:
t spins, but doesn't pump
drain line is clogged,remove the large hose that connect to pump to bottom of outer tub remove the cloth with pliers, propeller pump damaged replace
It doesn't spin or pump
frozen pump pulley replace pump,check manual, if doesnot replace it
It pumps, but the water returns
drain hose if reache more 4inches, cut ot the remain.if lower install air/gap siphon break assembly.
God bless you

see this possibles causes:
God bless you

attached diagrams
t spins, but doesn't pump
see line clogged and fix it.
It doesn't spin or pump
frozen pulley
It pumps, but the water returns
improve the drain laundry, if drain hose reaches more 4 inch cut off the excess

A washing machine is basically a big tub that repeatedly fills with water and then drains, spins to wring clothes dry, and has a device for stirring things up-- either an agitator in the middle of a top-load machine or a rolling drum in the case of a front-loader.
The four cycles that every washer performs are fill, wash, drain, and spin. Though these functions are pretty basic, a number of things can go wrong with them.
There are a number of problems that you can fix quite simply; some issues, however, are better left in the hands of an appliance repairperson.Problems that commonly occur with a clothes washer are discussed in depth below.If your washer doesn't run, be sure it's plugged in and that the receptacle works (the circuit hasn't overloaded). Before working on the washing machine, be sure to unplug it.
To prevent problems, follow good maintenance procedures. Use the right amount of detergent for your washer and your water hardness, make sure the machine is level, and don't overload it for the cycle chosen.

Washing Machine Does Not Fill
If the washer doesn't fill, the water inlet screens may be blocked. Clean or replace them. (Check your owner's manual for the location of the screens; they're often located at one end of the supply hoses, or you may have to remove a panel to access them.) Other reasons for not filling may be that either the timer or temperature selector is broken--both of these are repairs for an appliance repairperson.

Washer Does Not Spin
If your washer doesn't spin, check to see if the clothes have jammed or are unbalanced in the drum before calling a repairperson. Unbalanced clothes will also cause a w
asher to shudder or "walk." If straightening out the load doesn't stop the washer from shaking, look at the feet underneath and be sure they are properly adjusted to keep the washer sitting level on the floor (you just turn them to move them up or down).
Clothes Are Wet After Spin Cycle
If your clothes remain wet after your washer's spin cycle, perform the following diagnostics:
1) Lift the lid during the spin cycle. If the tub is not spinning, you may have a damaged motor coupler. Call a repairperson to replace this part.
2) If the tub is spinning, recheck the load to make sure it is balanced. If you are certain the load is balanced but your clothes are still wet, you may need to call a repairperson to replace a damaged motor pulley, tub bearing, belt, or clutch.

3) You can also follow the troubleshooting steps outlined in "Washing Machine Doesn't Drain." You may have a problem with your drain hose or pump.

The float on the water level shut off valve is probally stuck and not telling the washer that its full and to turn off the water. once thats fixed it will probally cycle normally. Try it on half load and see if the water stops at the correct spot.