Home › Washing Machines › Whirlpool › Error UB

Whirlpool Washing Machines Error Code UB - Drive Motor or Rotor Inverter Fault

Medium Severity

Error code UB on Whirlpool washing machines indicates a drive motor or rotor inverter fault detected by the internal system diagnostics.

Appliance: Whirlpool Washing Machines

Estimated Time: 10 minutes

Tools Required: Level, adjustable wrench

⚠ Common Symptoms & Observations

The Whirlpool drum refuses to spin; violent shaking or unbalanced banging; motor clicks and shuts down.

🔍 Root Causes for Code UB

Uneven clothing load (single heavy blanket or bath mat)
worn drive belt
failed Hall effect rotor sensor
motor controller capacitor fault.

🔧 Step-by-Step DIY Troubleshooting & Fix Guide

Pause cycle, open door, and redistribute wet laundry evenly around drum.

Check that all 4 leveling feet rest firmly on the floor without rocking.

If motor does not rotate by hand, check for trapped garments between drum and door boot.

🔄 Master Reset Procedure for Whirlpool

Unplug for 10 minutes to reset the inverter motor board. Reconnect and run a Spin Only cycle.

Technician Tip: If the error code reappears immediately after a hard reset, the control board has detected an active electrical open circuit or failed component that requires physical inspection.