SOURCE: bosch dishwasher shu4302uc
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.
Cheers…..Dave
SOURCE: Bosch SHX46A02Uc/21
it is likely a control module issue. I will take mine apart this weekend to verify what others have said: solder joint on circuitboard burns out from possible overheating, and DW doesnt go into rinse cycle. Try rinse and hold cycle to see if it stops on its own. mine does, but the other cycles which require the rinse to go to 156 degrees do not; the continue to run until I cancel and drain.
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