Why is it stuck on main wash cycle with repeated short fill/empty/run cycles?

MAIN CONTROL BOARD MIGHT BE PROBLEM

Lid closed safety switch is bad.....it must be in a normally closed condition to go to spin and rinse cycle.....You can jumper the switch........That will allow spin with lid open so be careful..............

Long shot, but does it fill the same as when new? I would check the atmospheric switch which is a hollow tube that runs down the inside of the drum(not in the wash cage) when the water fills, It pushes air up to stop the fill. It may have gotten clogged. Or partially clogged.

It may be time to descale. Most models will give you a message when it's time to have the mineral deposits cleaned.
HERES HOW TO DO THAT...
Empty water resevoir. Disable auto off. Pour approx 48 oz of undiluted white vinegar into resevoir. PLace large mug on drip plate, run brew cycle, dump contents of mug in sink. DO NOT USE A K-CUP.
Repeat this process until the add water light is indicated.
Let brewer stand for at least 4 hours while still on.
Discard any residual vinegar in the resevoir and rinse thorughly.
AFTER approx 4 hours...fill resevoir with water.
RINSE:
PLace a large mug on the drip plate and water brew cycle. Pour the contents of the mug into the sink.
REPEAT this brew process until the add water light is indicated.
YOU MAY NEED TO REPEAT THIS "RINSE" PROCESS if you notice any residual taste.

According to the owner's manual, you sould empty the water resevoir. Fill the water resevoir with white vinegar (it says 48 oz). Place a ceramic (not paper) cup in the drip tray and run a travel mug cycle with no k-cup in the machine. Throw the vinegar out. Repeat this process until the resevoir is empty. Be sure to open and close the lid so the cup sizes flashes each time. let the brewer sit for 4 hours while still on (the vinegar's still inside). Rinse out the resevoir, fill it with water and run the cycles through until the resevoir is empty again. If there is any residual taste. repeat the rinse. If it still say descale when you're done, the book says to repeat the process.

machine gets stuck on cycle and doesn't drain, the water just keeps coming.

Hi, Your dishwasher may pre-heat the water. If so, and if the water entering the dishwasher is cool, the heater may take up to half an hour to heat the water. To avoid the wait, increase the incoming water temperature before turning on the dishwasher. Do that by running the kitchen sink faucet until the water runs hot. Or increase the temperature of the hot water to the entire house at the hot water heater.
Timers don't often fail. But if every other part of the dishwasher seems to be working properly and the timer knob seems to be stuck in one place--doing one function continuously--the timer may be at fault. Dishwasher timers can't be repaired. If yours is defective, replace it.

check to make sure the drain hose is elevated. if not this will happen. hope this helps

will sence it will spin once the water is out .that must mean your pump is restricted.unplug go to buttom of washer find pump and clean out

Per Pages 9 and 10 of Keurig Model B40 Use and Care Guide,
1) turn off the "Auto Off "feature
2) fill empty water reservoir with 48 ozs of undiluted white vinegar.
3. Place ceramic cup on the drip tray and run a brew cycle. Do not use a K-cup!
4. Press the large mug Button
- let Keurig coffee maker fill mug with vinegar & empty in sink.
5. Repeat brew process until water reservoir of vinegar is empty. (remember to open and close lid between each cycle so large mug Button will flash.
6. Rinse the water reservoir thoroughly and fill with fresh water.
7. FINAL STEP RINSE CYCLE
a) place a ceramic cup on the drip tray
b) run regular brew cycles WITHOUT using a K-cup.
c) pour rinse water into sink each time.
d) repeat brew process until water reservoir is empty.
d) perform additional rinse cycles if you notice any residual vinegar taste.
e) if the red "De-scale" light remains illuminated after completing descale and rinse cycles, repeat the descaling procedure above.
Otherwise - you're good to go!