My whirlpool thin twin washer stopped working. The dryer still runs but the washer does not.

Could you check that model number again?Could you please describe the problem you are having?
Does the dryer run at all?
Check the door switch. When you push and release it you should hear a click. If not, replace with a new switch.

I have a Thin Twin manual that will give you an idea of where to start:

THIN TWIN SERVICE MANUAL


If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

first access the tech sheet and run any diagnostics it shows for the machine and if this passes,then check/change the fill switch on the control panel along with fill tube from the wash tub base if kinked or plugged

Well if it fills then it needs the lid shut to work. So if the lid is shut it hits a lidswitch and if that lid switch is broken then nothing will work washer wise right? As far as the dryer that may be a blown fuse but nothing on the washer could stop it from running cept maybe a bad cord or breaker.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

My twin stacking whirlpool washer/dry. The timer switch kicks on but does not dry clothes kicks off after 5 mins but, clothes still wet.

Remove the pump system like this off the Hotpoint wd640 . Remove any blockage inside and retry.

Try this:

http://en.allexperts.com/q/Major-Appliances-3603/Whirlpool-ThinTwin-Stackable-Washer.htm

The belt is broken and needs to be checked for any other part that has failed causing the belt to burn.

Replace the timer/control board

the thermostat might need replace