Dishwashers. Freestanding dishwashers. Freestanding dishwashers with 60cm width; ... Register your Bosch appliance. ... E20; E21; E22; E23; E24; E25; E27; Low salt indicator is lit; Water tap (LED ) / Water inlet check; Home Connect problem. App - function faulty; App is not loading;. E20 / F20 To receive this error code means there is unexpected heating. To fix this issue, you will need to reset the washing machine by switching it off and on. You may need to do this from the power source. E23 / F23 This error code means the aquastop is activated. This means that there is likely to be water in the base of the washer. This Bosch 300 Series 24-inch built-in dishwasher has all the functionalities and options you need to help you wash your dishes. ... Just one month after the warranty expires I go to turn the unit on and am welcomed with E20 on the display. a little google sleuthing and it turns out this means the heat pump or heat pump wiring harness is bad. Lists the error codes of Bosch dishwashers with decoding and description of a specific code (E19, h01, h02, E09, E15, E04, E24, E09, E14).