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The F28 error on your Whirlpool Washer means there is a communication problem between the main control board and the motor control unit (MCU). This error typically requires checking electrical connections and may involve component replacement.

Error code F28
Meaning Communication failure between the main control board and motor control unit
Severity High — Washer will not operate until resolved
Time to fix 15–60 minutes
Tools needed Multimeter, socket set or nut driver, screwdriver, flashlight

What the F28 error means

The F28 error code indicates that the central control unit (CCU) is unable to communicate properly with the motor control unit (MCU). These two circuit boards work together to control the washer’s motor functions, including spin speed and direction. When communication between them fails due to loose connections, damaged wiring, or faulty components, the washer will display this error and refuse to operate as a safety precaution.

Common causes

  • Loose or corroded wire connections between the control boards
  • Damaged wiring harness with broken or frayed wires
  • Faulty motor control unit (MCU) that cannot send or receive signals
  • Defective central control unit (CCU) with communication failure
  • Power surges or electrical interference disrupting board communication
  • Water damage to electrical components from leaks or excessive moisture

How to fix the F28 error

  1. Reset the washer and check for temporary glitches — Unplug the washer from the electrical outlet for 5 minutes to allow the control boards to reset. Plug it back in and run a test cycle. If the error was caused by a temporary communication glitch or electrical interference, this may resolve it. If the F28 code returns immediately or during the cycle, proceed with further troubleshooting.
  2. Inspect wire harness connections between control boards — Unplug the washer and remove the back or top panel to access the control boards. Locate the wire harness connectors between the central control unit and motor control unit. Disconnect each connector and inspect for corrosion, burnt pins, or debris. Clean any corrosion with electrical contact cleaner and ensure all connections are firmly seated. Wiggle the connectors gently to check for loose terminals.
  3. Examine wiring for damage — Follow the wiring harness from the CCU to the MCU, looking for any signs of damage such as frayed wires, cuts, melted insulation, or pinched cables. Pay special attention to areas where wires pass through metal brackets or near moving parts. If you find damaged wires, they must be repaired or the entire harness replaced. Check that wires are properly routed and secured away from sharp edges.
  4. Test the motor control unit — Using a multimeter, check for proper voltage at the MCU (typically 120V AC at the power input). Inspect the MCU circuit board for visible signs of failure such as burnt components, bulging capacitors, or scorch marks. If the MCU shows physical damage or doesn’t receive proper voltage, it needs replacement. The MCU is typically located near the motor at the bottom of the washer.
  5. Test the central control unit — Inspect the CCU for signs of damage, water exposure, or burnt components. Check that the CCU is receiving proper voltage (typically 120V AC). If the wiring and MCU check out but the error persists, the CCU itself may be faulty and require replacement. The CCU is usually mounted behind the control panel or on top of the washer cabinet.
  6. Replace faulty components — If you’ve identified a defective control board, order the correct replacement part using your washer’s model number. Disconnect all wire harnesses from the faulty board, photograph the connections for reference, remove mounting screws, and install the new board. Reconnect all harnesses securely, restore power, and test the washer. If both boards are suspect, replace them one at a time to identify the actual culprit and avoid unnecessary expense.

FAQ

Can I fix the F28 error myself or do I need a technician?
You can handle the initial troubleshooting steps yourself, including resetting the washer and checking wire connections. However, testing and replacing control boards requires some technical skill and comfort working with electrical components. If you’re not confident using a multimeter or accessing internal components, it’s safer to call a professional technician. Control board replacement costs typically range from $250-$450 including parts and labor.

How much does it cost to replace a Whirlpool washer control board?
The motor control unit (MCU) typically costs $150-$250, while the central control unit (CCU) ranges from $180-$300 depending on your model. If you hire a technician, expect to pay an additional $100-$150 for labor. Many homeowners can perform the replacement themselves if they’re comfortable with basic appliance repair, which saves the labor cost.

Will the F28 error damage my washer if I keep trying to use it?
No, the F28 error is a protective measure that prevents the washer from operating when communication is compromised. The washer will not run with this error displayed, so you cannot cause further damage by attempting to start it. However, you should avoid repeatedly power-cycling the machine or forcing cycles, as this won’t resolve the underlying communication issue and wastes your time.


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