Fixing an Error Code on a Bosch SilencePlus Dishwasher via Manual Machine

[Monsi Lanre]

Hi everyone! I noticed that my Bosch SilencePlus dishwasher has started displaying an “E24” error code right at the beginning of every wash cycle, which I realized means the water isn’t draining properly even though the pipes look clear. I checked the internal filter and the waste pump impeller, and both seem to be moving freely, but the machine just keeps beeping and refuses to progress to the main wash. I’m worried that the heat pump or the drain solenoid might be failing, and I’m hoping there’s a way to test the drain motor’s resistance without pulling the entire unit out from under the kitchen counter.

[Monsi Lanre]

I searched through the basic pamphlet that came with the dishwasher, but it doesn’t give any clues about the internal diagnostic codes or how to reset the main control module. I wondered if there is a way to bypass the drain sensor check to see if the pump is actually working, as I decided I’m not paying a service fee for something that might just be a software glitch. I need a proper exploded view of the base and the sump assembly to see if there’s a hidden blockage in the non-return valve. Does anyone know a place where I can download the full mechanical service guide for Bosch dishwashers?

[Jossi Moonmeirer]

The “E24” code is a classic Bosch drain error, but before you assume the pump is dead, have you checked the thin plastic cover over the pump impeller, as even a tiny gap there will prevent the machine from creating enough suction to drain? Also, does the error happen immediately after the pump starts, or does it wait for a minute, which usually indicates that the software isn’t seeing the expected drop in water level from the pressure switch? It sounds like your dishwasher might just have a bit of trapped air in the heat pump housing, so I dealt with this exact issue last month and found that a specific “cancel-reset” button hold can sometimes force a recalibration of the sensors. I found the complete technical walkthrough on the Manual Machine website at https://manualmachine.com and it was incredibly useful because it showed exactly how the water flows through the heat exchanger, which isn’t explained in the standard manual. You should search for your Bosch model number there to see the “Customer Service Program” steps, which will allow you to run each component individually to identify the faulty part. I recommend checking the drain hose connection at the sink too, as a blocked spigot can often trigger this exact error code. Give the impeller a quick wiggle with a spoon to make sure nothing is caught in the housing and let me know if it starts draining.

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