Kenmore Washing Machine F28 error code

The main control board (CCU) and the motor control board (MCU) lost their serial communication link. The washer stops because the motor cannot be controlled.

Also shown as: F28, F 28

Last updated: October 6, 2026

Quick answer: Kenmore washing machine error code F28: boards lost communication. The most common cause is loose serial-link connectors between the CCU and MCU, often shaken loose by spin vibration. Try this first — power-reset the washer. If that does not clear it, level the washer.

What causes the F28 error?

  • Loose serial-link connectors between the CCU and MCU, often shaken loose by spin vibration
  • Corroded or damaged blue serial wires
  • Failed motor control unit (MCU)
  • Failed central control unit (CCU)
  • Washer not level, causing heavy vibration

How to fix Kenmore F28 — step by step

Work through these in order, from simplest and safest first. Stop as soon as the code clears.

  1. Power-reset the washer
    Unplug the washer for 10 to 20 minutes, then plug it back in and press Stop twice to clear the display. Try a short cycle.
  2. Level the washer
    Make sure all feet touch the floor and the cabinet does not rock. F28 often strikes during final spin, when vibration is strongest, and loose connectors are the usual cause.
  3. Tighten the serial-link connectors
    Unplug the washer and remove the top panel. Find the three blue wires that run between the CCU and the MCU and push each connector on firmly. Reassemble and run a spin cycle to test.
    Safety warning: Unplug the washer before removing panels or touching wiring.

When to call a technician

Stop and call a qualified technician if any of these apply:
  • F28 returns after tightening the connectors and leveling
  • Connectors or wires look burnt or corroded
  • The MCU or CCU needs replacement
  • The motor or drive system shows worn or failed parts

Frequently asked questions

What is the difference between F11 and F28?

Both are serial communication failures between the two control boards. F11 is usually detected at startup or early in the cycle, while F28 often appears during high-speed spin when vibration breaks the connection.

Why does F28 only happen during final spin?

Final spin is the fastest and longest part of the cycle. The vibration can shake the serial-link connectors just enough to break communication for a moment.

Do I need to replace the control boards?

Not always. Many F28 cases are fixed by tightening the blue serial-wire connectors and leveling the washer. Replace boards only if the code returns with solid connections.

Sources

Every meaning and fix above was checked against official manufacturer documentation:

FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.

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