Chosen Solution
Hi everyone, first time posting here. My Bosch shu43c05uc/17 dishwasher isn’t spraying water or cycling through. The spray arms are clean and the filter is clean, so I don’t believe that’s the problem. I’ll start it, hot water gets pumped in, and there’s a loud hum sound. It’ll run for the duration of the cycle, but it won’t cycle through the different modes. It’s a sound that isn’t typical. And sometimes it will sit on the last minute until I cancel the cycle. It is able to drain. I’ve reset it via turning power off. I’ve run the diagnostic, but I don’t believe that’s working properly (only showing the number “2” which isn’t an option online). The Bosch manual is terrible and provides zero information on this. Bosch told me to reach out to an authorized service tech. What are some options causing the problem? I’m not finding much information online and before I call the handy man, I’d like to narrow down my options because their troubleshooting gets quite costly. And I’d even do the repair myself if it was reasonable. Any help would be greatly appreciated, thanks so much!
@bigdchi actually the digit #2 does make some sense: DISHWASHER TEST PROGRAM ERROR CODES (on 2 & 3-digit digital displays): 0 –No faults 1 –Aqua Sensor (Sensotronic) fault 2 –Heating system fault (heater, Hi-Limit, flow switch, NTC, control heater relay) 4 –Water filling fault 8 –NTC (temperature sensor) fault 16 –Water switch fault This should work for your model as well
not sure where this different sound may come from but I wonder if this is not related to the flow switch
Hi @bigdchi , According to this link the dishwasher has a circulation pump (and also a replacement circulation pump impeller and seal kit - interesting that there is a replacement for this - does it fail often enough to have a spare!) as well as a drain pump. This link also has the parts but also shows the parts diagrams (use the slider down the right side of the diagrams to see more), which may be of some help, e.g. the pump impeller kit part #424 is in the Component assembly diagram Regarding the hot water. I was confused when you originally said that “….. the hot water gets pumped in…”. I took this to mean that you were supplying hot water to the dishwasher. If this was the case it may still require a heating element to increase the temp to the set wash temp if this was higher than what was supplied.
@csaab , What is the model number of the dishwasher? Have you checked that the spray arms are moving or have moved? Try placing both spray arms in a position that you remember and then turn on the dishwasher. After it has filled and started to “wash” open the door and check the position of the spray arms. It is the water pressure from the circulation pump that causes the arms to rotate, dispensing water. If they haven’t moved then you need to check if power is getting to the circulation pump or if both spray arms dispensing holes are all blocked which would seem unusual. If only the top spray arm hasn’t moved then it may be a blocked pipe from the circulation pump to the spray arm as usually the lower spray arm is connected nearly at the pump housing Since you have changed the pump and the control panel but not the control board first try using an Ohmmeter to check the continuity of the pump power supply wires from the control board to the pump. Do this with the power totally disconnected from the dishwasher. If you know how to safely test for lethal voltages you could use a Voltmeter and check that voltage is being applied to the pump when it is in the wash cycle. Depending on your location it could either be 120V AC or 240V AC
I have this happening as well. Serendipitously I was able to investigate and find a temporary fix, but not sure how to / what to replace. I removed the circular drain cap in the middle, remove the silver tray and then remove the circular screen. Once all that was removed, inside the bottom of the dishwasher, on the right side, there is a hole about the size of your finger and a few inches in, there is what feels like a check ball (like a marble at the end of the shaft) This must be some sort of check ball that allows the water in to circulate through the spray arms. I wiggled it and felt it loosen up a bit. I ran the cycle and it ran perfectly. The downside- I have to do this every other time to get the dishwasher to run.
