We have a Bosch SHU4312 that is over 10 years old. It has worked fine until last night it began the scrub cycle, filled with water, dumped soap, and ran for over 3 hours, washing with water circulating inside, without pumping any water out. It made a "humm-whish" noise over and over. Soapy water inside was steamy hot, and there was no overfill. None of the filters were plugged.
The control board on these units is prone to a cold solder joint cracking. I have read that Bosch recommends replacement and will supply the board, not covering labor. I repaired mine prior and have done one for a friend as well. Has lasted several years and counting
The symptom is constant cycling without ticking down the last few minutes
I solved this by replacing the controller module. It had a PC board failure that was obvious upon inspection.
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