F28
Whirlpool Washing Machine
Severity: CriticalWhat Does This Error Mean?
Whirlpool error F28 means there is a communication failure between the main control board (CCU) and the motor control unit (MCU). These two boards need to talk to each other to run any wash cycle. When communication breaks down, the washer stops completely.
Affected Models
- WFW9620HW
- WFW9620HC
- WFW8620HW
- WFW5620HW
- WFW6620HW
Common Causes
- A wiring harness connecting the CCU and MCU has a loose, damaged, or corroded connector
- The main control board (CCU) has failed and can no longer send signals to the motor controller
- The motor control unit (MCU) has failed and is not responding to commands
- A power surge or voltage spike damaged the communication circuit on one or both boards
- Moisture or a water leak inside the machine has corroded connector pins
How to Fix It
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Unplug the washer from the wall outlet. Wait 5 full minutes.
This gives both the CCU and MCU time to fully power down and discharge. A power reset resolves communication errors caused by temporary glitches about 20% of the time.
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Plug the washer back in and try running a cycle.
If F28 is gone, the error was a temporary glitch. Run a full wash cycle to confirm the washer is working normally.
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If the error returns, unplug again and locate the wiring harness that runs between the main control board and the motor control unit.
On front-load Whirlpool washers, the CCU is typically behind the top panel and the MCU is near the motor at the back or bottom.
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Carefully disconnect and reconnect each connector on both ends of the harness.
Push each connector in firmly until it clicks. Loose connectors are a common cause of F28 and are free to fix.
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Plug the washer back in and test. If F28 persists, one of the control boards needs professional testing and likely replacement.
A technician can test each board with a multimeter to determine which one has actually failed before ordering parts.
When to Call a Professional
F28 almost always requires a technician unless you are comfortable with appliance electronics. Connectors can be reseated at home, but board replacement requires proper diagnosis to avoid replacing the wrong part. Expect $200 to $400 for CCU or MCU replacement including labor.
Frequently Asked Questions
How do I know if the CCU or MCU is the broken one?
You generally cannot tell without a multimeter and some electrical knowledge. A technician will test each board by measuring the voltage signals on the communication wires. Replacing both without diagnosis wastes money — proper testing identifies the failed board.
Can a power surge cause F28?
Yes — a power surge can damage the communication circuit on the CCU or MCU, causing F28 to appear. Using a surge protector on your washer can help prevent this. If a surge recently happened in your home and F28 appeared shortly after, that is almost certainly the cause.
Is F28 covered under Whirlpool's warranty?
If your washer is within its one-year limited warranty, yes — control board failures due to manufacturing defects are covered. Extended warranties may cover it beyond that. Call Whirlpool at 1-800-253-1301 to check your specific situation.