David G Lindon , UT November 02, 2022 Appliance: Whirlpool Dishwasher WDF520PADB7 Whirlpool Dishwasher Wdf520padb7: Code 4 3 the circulation pump was not working.. How to replace Dishwasher Circulation Pump And Motor. I replaced the Circulation Pump. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours