Bruce L Acton , ME March 15, 2020 Appliance: Bosch Washer WFMC3301UC/02 Bosch Washer Wfmc3301uc/02: Bosch nexxt 500 series washer e04 error. How to replace Drain Pump Motor Assembly. When I searched for this error message your website popped-up with the Drain Pump Motor Assembly suggested as a need. After reading all the positive feedback from other customers I ordered the pump. Installation was smooth. And the washer is running like new. Ordering the part was simple and it fit exactly as the original pump. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes