Checking the drain pump motor: Bosch Dishwasher E:23

What E:23 means

Unlike a blocked drain, E:23 blames the drain pump motor. A technician measures resistance across a pair of the pump's terminals and compares it with the published value. If it reads correctly the module is suspect, and if not, the pump is. A disconnected or damaged pump cable sets off the same code, so wiring is checked before any part is ordered.

Common causes of E:23

Drain pump motor winding failed
Pump wiring broken or unplugged
Power module not able to drive the pump

✓ One safe check you can try

1. Start a short program. 2. Listen near the end of the fill for the drain pump. 3. A faint hum with no water moving, or silence where a clear whirr used to be, fits this code. 4. Stop the cycle, and hold off on more cycles until the pump has been looked at, and leave the measuring to a technician.

! Why to stop there

The reading must be taken at specific terminals and compared with the figure for that pump.
Replacing a pump that tests good leaves the module as the true cause.
A pump that hums without moving water can overheat its winding.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

→Same appliance

Other Dishwasher codes

E:30Bosch Dishwasher E:30, voltage too high and the machine shut down E:31Water in the zeolite container - Bosch Dishwasher E:31 FBosch Dishwasher F on an older display (water filling) 2HBosch Dishwasher 2H: Long Cycle Warning on Older Displays 1Bosch Dishwasher Service Test Result 1: Aqua Sensor 2Bosch Dishwasher Service Test Result 2: Heating Group 4Bosch Dishwasher Service Test Result 4: Water Filling 8Bosch Dishwasher Service Test Result 8: Temperature Sensor

E:23E:23 questions

My dishwasher hums but does not drain. Is that E:23?

It could be. A hum with no water movement fits a pump motor that is trying and failing, though a blocked pump produces similar sounds. We check the pump and the filter.

Can I drain the water by hand until it is fixed?

You can bail the tub with a cup and sponge, but the dishwasher should not be run again until the pump is repaired. The water will return each cycle.

What happens if the module is the cause?

Then the pump tests normal and the module needs repair or replacement. We explain the result, and the written price covers whichever part the readings point to.