Customer Questions and Answers for Circulation Pump by Bosch

Pope, Yes, you can bench test the drain pump of the unit by applying 120 vac to it. This will tell you whether the drain pump is working. You will also want to check the drain line to make sure that there is no clogging. Check with the drain in place at the control board with the unit in a drain cycle and test to make sure that the control is putting out 120 vac to the drain pump.