Jimmy T Longmont , CO June 26, 2015 Appliance: Whirlpool Undercounter Dishwasher GU1200XTLB3 Whirlpool Dishwasher Gu1200xtlb3: Dishwasher pump not working. How to replace Dishwasher Circulation Pump Motor. Replaced motor Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours