Our son has a Bosch DW Model SHX43CO5UC/46. Purchased in April 2008. Machine worked fine. Was removed for a kitchen remodel-then reinstalled. It won't work now...just hums when turned on. He did place a quart of water in the bottom - it was pumped out. He then turned it on and it started to cycle - then back to the hum. One tech came out and could find no problem. A

SOURCE: Bosch dishwasher model shu3300

Your machine has detected a "flood" condition and has defaulted to its flood mode. Meaning that only the drain pump will work until the flood is fixed.

Bosch D/W's are pretty slick, the entire unit is sitting inside a drain pan that's designed to catch an overflow (flood) keeping the water off of your floor. This overflow pan has a Styrofoam float that rises with the flood and trips the "flood mode". The water in the pan has to be removed allowing the float to drop back down before you can use your dishwasher again.

There are 2 ways to do this... the easy way and the hard way.

1.) Easy way---> Wait a few days. The water will eventually evaporate out of the drain pan all by itself. Takes longer than the hard way, but no tools are involved.

2.) Hard way---> (not actually "hard") TURN POWER OFF TO THE DISHWASHER! Remove the lower kick panels (below the door). Remove the 2 screws holding the water valve in place, and push the valve up as far as you can. Now use a "Shop-Vac" with a long crevice tool attachment. Stick the crevice tool in where the valve was... make sure to reach in there about 8 or 9 inches, (the safety float is in there on the left, you can see it with a flashlight) otherwise it won't reach the water. Now simply suck up as much water as you can. You won't be able to get it all, you just need enough removed to drop the float.

Now try your D/W... after a normal 2 minute drain, it should fire right up.

SOURCE: Bosch SHX46A dishwasher

I have a Bosch SHX46B05UC/14 and it stopped functioning right. It filled, it ran, it drained, it sounded okay, but I finally determined there wasn't enough circulation pump pressure to swing the spray arms. Turns out the problem was a pump pressure adjustment screw, accessible under the kick plate, had backed off--now if I can only figure out how to set it properly, low enough to clean the glassware, high enough not to break the pots and pans--or is it the other way around. I also found some beans in the drain sump (easy to remove cover plate from inside with a torx driver, large object trap not locked down properly and a riser for the upper spray arms not press fit sufficiently into pump outlet (I wonder if I blew the line while setting pump pressure. I AM looking for guidance on how to properly set the pump pressure, for the moment, I simply turned it into its spring loaded range and cranked it down a few turns.

SOURCE: Bosch Dishwasher wont drain

Crazy! I have the EXACT same problem....sounds like it wants to drain...but won't ...Water has been stuck in the bottom for days now

SOURCE: Bosch dishwasher: won't fill with water

The flood switch is tripped. This is located under the unit. Unplug or flip the breaker to the dishwasher, take off the black kick plate under the door, 2 screws, and you will see the white plastic "pan". The flood switch is located where you can't really see it but it is on the left hand side wall and is made of styrofoam. The best thing to do is to put some rags in the pan, this is not easy because there is little room to put them, and soak-up the water that has filled the pan. Eventually you will get enough water out that the float will deactivate the switch. What you hear "running" when you turn it on is actually the drain pump, it get activated when the flood switch is tripped.

SOURCE: Bosch dishwasher timer sticking

I have been told to replace the timer which I am looking to do the same to my machine!