Washer will not start any cycle; display shows F01 and may beep repeatedly.

Safety First: Unplug the washer or switch off the dedicated breaker before removing any panels. Capacitors on the control board can hold a charge briefly after power is removed.

Step-by-step checks:

• Power reset: Unplug the washer for 5 minutes, then plug back in and try a rinse/drain cycle. Sometimes a transient fault clears.
• Inspect power supply: Verify the outlet has 120 VAC using a meter. Check that the washer’s power cord is not damaged or overheated at the plug.
• Access the main control (CCU): Remove the top panel (usually 3 screws at the back, slide back and lift). Locate the main control board (often mounted at the rear or side under the top).
• Check harness connections: With power still disconnected, remove and reseat each connector on the CCU one at a time. Look for burnt pins, corrosion, or loose terminals.
• Inspect the board: Look for burnt spots, cracked solder joints, or swollen components. Any visible damage usually means the CCU must be replaced.
• Test line voltage into CCU: With extreme caution and only if you are comfortable with live testing, restore power and verify that the CCU is receiving proper line voltage at its input terminals. If no voltage, trace back to the line filter and power cord.

When to replace: If wiring and power are good but F01 persists, the main control board is likely defective and should be replaced with the correct KitchenAid part number for your model. Label all connectors before removal to avoid miswiring.