I have a Bosch dishwasher Model number SHU4302UC. The dishwasher takes about four hours to wash dishes. During the rinse cyle it can be running for over an hour and I will open it to look in side and find that the bottom is full of soap sudds. I believe it is taking too long to wash even though it does a good job.

Is the water supply hooked up to the hot water are you rinsing the dishes before you insert them in the dishwasher did your dishwasher low on

I would call Bosch with you.re model and serial number, they have had a recall on your model for the control board and that sounds like it may be your problem, if it is under recall Bosch will send someone out at no charge to install a new board (800) 856-9226

make sure that your filter in the bottom is clean and if you are using the automatic wash cycle, it will wash until the water is clean. Sometimes it will take an hour, sometimes it will take close to 2 depending upon the level of dirty dishes in the dishwasher. And don't rinse! They work better on dirty dishes.

Maybe wash temperature. The machine may be trying to heat the wash water to a preset temp and it is taking an extended time to get there. Maybe a faulty temperature probe or a bad element?
I know you will ask how this is possible when you have a final temp of 120 but that sound like a drying cycle temperature to me; not a wash temp.
I would leave the thermometer in through the cycle and you will probably find it will slowly get hotter in wash cycle and finally switch after a certain temp has been obtained.

There is a recall on the control board of many of these models. I have written a guide to help. It is here. Look for the phone number near the top.

There are no adjustments for cycle timing. What does affect timing is temperature of the water coming into the DW. The hotter your supply water, the shorter the time to cycle, BUT if your water is too hot, the cycle time may become too short to light the NSF 'Sanitize' indicator. But since the cycle is taking so long, this is an indication that the DW's water heater is not heating the water hot enough to advance the countdown timer in a timely manner. The control logic is waiting for the temp to come up to an appropriate level to ensure adequate washing, rinsing or drying times. Likely your display is showing '1' for a long time as a symptom of this problem, as well.  - This link http://www.applianceaid.com/boschDW.html has procedures to run self-tests on various Bosch models. I suspect that you can confirm a 'heater fault' on your unit by running the self-test.  - This problem invariably relates to a 'heater fault' which has usually been traced to an open solder joint on the control board located behind the switches/indicator lights on front door. If you have a Torx driver, soldering iron & bit of solder, you can effect a repair yourself in about an hour. Otherwise, a replacement control board is required.
-  If you'd like to attempt replacing the control board yourself, refer to this link for part & DIY information. http://www.appliancejournal.com/appliance-parts/bosch-appliance-parts/bosch-dishwasher-control-module-266746-37/
- Else, place a service call to the tech of your choice.
  

timer

Hi,
You could try running the machine with the drain hose leading to a large bucket. If it works OK in this situation then the blockage will be most likely where the drain hose joins the house drainage system - often at a junction under the kitchen sink. With the drain hose disconnected you should be able to see the blockage and clear it with a suitable pointy tool.
Let me know if this sorts it. Thanks, D.

It sounds like a thermal stop. The water in the rinse wants to get up to a certain temp to satisfy the thermistor but doesn't reach it so it will stay there. If you have an amp probe you can put it on to see if the heater is coming on. This could be your problem.

Sgt 48

Do you have high temp rinse or sanitize selected? This will pause the timer during the final rinse cycle to heat the water. The sensor might be bad. Try the quick cycle, I don't think this heats the water.