The F28 error code on a Kenmore washer indicates a serial communication failure between the main control board (MCU) and the motor control board. These two boards communicate constantly during operation, and when the signal is lost or corrupted, the washer displays F28 and stops the cycle.
Causes of the F28 Error
- Loose or damaged wiring harness between MCU and motor control board
- Defective main control board
- Defective motor control board
- Power fluctuation causing a communication reset
Troubleshooting
- Unplug the washer for 1 full minute and restart.
- If F28 returns, check the wiring connections between both control boards (requires accessing the back panel).
- If connections are secure and the error persists, one or both control boards requires professional diagnosis.
Our technicians use Kenmore diagnostic tools to identify which board is at fault, replacing only the defective component to keep repair costs as low as possible.