Washer displays F09 and may have water remaining in the tub or may overfill and then drain continuously.

Safety First: Disconnect power and close water supply valves. Be prepared for water drainage.

Step-by-step checks:

• Verify drain hose height: Ensure the drain hose is installed at the correct height (usually 39–96 inches above floor) and not sealed airtight into the standpipe. Incorrect installation can cause siphoning.
• Check inlet valves: With power off and water on, observe if water seeps into the tub. Replace the valve if it leaks.
• Inspect pressure system: Check the pressure hose and switch as in F05. A blocked hose can prevent the control from seeing the correct water level.
• Clear excess water: Manually drain the tub via the pump filter or by gravity through the drain hose into a bucket.

When to replace: Replace the water inlet valve if it does not fully close. Replace the pressure switch if it fails continuity tests. Persistent overflow errors with good components may indicate a faulty main control.