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The BOSCH SHU 4306 CU dishwasher (DW) is 20+ years young. It did develop very unpleasant behaviour. Any of the available wash cycle starts in correct way. These wash cycles are: POWER SCRUB PLUS, SCRUB WASH, REGULAR WASH, RINSE & HOLD. Here are step by step description of events. press ON switch the DW starts with the short drain sequence the DW starts with wash mode which was used in previous washing cycle water valve is enabled, water flows into the DW after while the big high pressure pump is activated and dishes are getting washed water continues to flow into the DW the safety floater starts to climb when it reaches the top point, the drain pump kicks in the water valve is disabled, water stops flowing into the DW in this moment, the water level is a little bit lower (see (9)) the safety floater goes down, the drain pump stops running the water valve gets enabled, the water is flowing again into the DW steps (7), (8), (9), (10), (11), (12) get repeated 15-25 times. Approximately once per second then, there is no cycling for approximately 15-20 seconds after these 15-20 seconds, the cycles 7-12 are again executed This goes for ever. If I interrupt the process, by simultaneously pressing POWER SCRUB PLUS and REGULAR WASH buttons, the DW goes into the DRAIN mode. All the water is pumped out from the DW and the CLEAN LED is activated. I did expect that at the end of the DRAIN process, the water valve will be disabled. But it isn't. The water continues to flow into the DW. Please, help out to debug and find the root cause for this unpleasant behaviour. Thanks