Common problem with these. Control panel (behind all the buttons on the door) has a thyristor in the middle of the PCB for switching the heater element ON/OFF.
After many screws and a bit of fiddling about, get access to back of PCB (print side) to find dry joints. Clean and re-make joints and all should be well.
Caution, this is a high voltage area. Disconnect from mains.
Please see photos.
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Have you insured the unit is connected to a hot water supply line ? The water will not heat until it start's to circulate and activates the "flow switch" in the Bosch dishwashers.
If it is connected to a hot water supply, try running the hot water at your sink taps before turning on the dishwasher. If you still do not have hot water, check your hot water heater or supply.
If it is indeed connected to a cold water supply it will work, just be prepared for very long wash cycles since the Bosch machines will heat the water at a rate of 2F per minute...it could take a long time to reach 155F.
Let me know what you find out and I'll try to assist you in any manner I can going forward.
if your on demand heater is one of the small ones that mounts under the sink, it will not flow enough water to fill your dishwasher. the dishwasher is waiting for the water level to fill before it starts washing. your bosch will heat its own water. hook it up to a cold line ahead of the water heater so that the fill valve is fed with full pressure. the residue sounds like detergent build up. when you get the water issue resolved, run a few cycles with no dishes and no detergent, on the highest temp setting. add a cup or two of white vinegar or dishwasher cleaner ( order online or get from an appliance repair store) through it. Dont forget your dishwasher has a filter in the bottom under the spray arm that needs to be cleaned periodically. if you dont clean it once a month it will get all kinds of nasty stuff built up in there.
The dishwasher has a built in instantaneous water heater, so even if the water feeding the d/w is cold the machine will heat it the the temp required for the cycle you have choosen. Reducing the temp will not effect the wash quality at all, in fact having a lower temp or cold water filling the machine will make the drying cycle at the end of the program more effective.
Hope this helps, please leave feedback.
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 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.
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.
Bosch dishwashers are designed to heat the water to temp. However it has a 3 hr default if it doesn't reach temp. Start the cycle and see if after 1 hour if the water is hot or cold. If hot, then it is heating the water and the water coming in is just too cold. You may try running the water at the sink to get it hot there first before starting the dw. If the water is cold, then your unit isn't heating the water. At this point I pull the outer door panel, find the largest wires on the control unit and put my meter leads on them then start the machine. You will see 120 volts on your meter. Start the machine in light washes and with in 10 to 15 minutes you should see 0 voltage. Than means the relay has closed in the control and the hot line of the 120 volts is being sent to the heater. If this never happens, then you have a bad control. Bosch dishwashers have a 5 yr part warranty on the electronic control. Now If you get the 0 volts, I will put my amp meter on one of the same wires and check for 9 to 11amps. If that isn't there, then you have a bad heater assy. Hope this helps