F11
Kenmore
Serial Communication Error Between CCU and MCU
Washer intermittently stops with F11; may beep and pause; sometimes resumes if door is opened/closed.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Loose wiring harness between main control and motor control, oxidized connectors, failing main control board, failing motor control board
How to Fix / Troubleshooting
Safety First: Unplug the washer before accessing internal components.
Steps:
- Access controls: Remove the top panel to reach the main control (CCU). Remove the rear or bottom panel to access the motor control (MCU).
- Reseat harnesses: Identify the multi-wire harness connecting CCU to MCU. Unplug each end, inspect for corrosion or bent pins, and firmly reconnect.
- Secure wiring: Ensure the harness is not rubbing against sharp metal or moving parts. Use cable ties to secure if needed.
- Inspect boards: Look for burnt spots or cracked solder joints on both CCU and MCU. Any visible damage usually means replacement is required.
- Test operation: Reassemble and run a diagnostic cycle. If F11 recurs, replace the more commonly failing board first (often the CCU on many Kenmore front-loaders).
Note: Because this is a communication fault, accurate diagnosis may require a service manual and meter; consider professional service if unsure.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (CCU)
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