MOTOR CONTROL UNIT ERROR The Motor Control Unit has internal failure; repeating under or over voltage, or over current conditions. If failure occurs during high-speed spin the door unlocks after 3 minutes.
The notorious F11 code
This is a very common problem and sometimes a costly one. Always unplug the machine first. Then make sure the drain filter is clear. It seems if the pump has any interruption it can cause the serial communication problem. A recent f21 or suds error can also indicate a clogged drain and cause the f11 error also. Next make sure the door is closing properly if it is not stuck locked. If it is stuck locked the pull tab is located behind the bottom panel. Next you will need to remove the top lid and tip the front panel forward, this is to access the CCU ( main control). Find the wires going to the door lock, these will be marked on the tech sheet. When the door is closed you should have 1 ohm if not replace the door lock assembly. Infinite continuity when the door is open. If the door lock checks good, check all connections at the main control. Not just for a tight fit but unplug each connecter and check the connectors for corrosion with a strong flashlight, clean connectors. Next remove the lower panel and access the MCU (motor control unit). Unplug the connector and remove the MCU and check each connection thoroughly. If everything has checked out good you will need to replace the MCU. But before purchasing this I would put it back together and try it, sometimes you had a bad or loose connection and didn’t notice it. Many times this is a loose connection.
1. Unplug washer or disconnect power.
2. Check wire harness connections between the drive motor and the Motor Control Unit (MCU), and between the MCU and the Central Control Unit (CCU). Check the motor and do a continuity test.
3. Plug in washer or reconnect power.
4. Check the MCU by looking for operations of the drive motor.
5. Check the drive motor for powered rotations.
6. Replace MCU board.