Washer-dryer combo overfills or shows F08 shortly after filling starts.

Safety first: Unplug the appliance and shut off both hot and cold water supply valves.

• Check water valves: Turn water supplies back on briefly while the unit is unplugged. If water continues to flow into the tub, the inlet valve is mechanically stuck open and must be replaced.
• Inspect pressure system: Verify the pressure hose from tub to pressure switch is not kinked, blocked, or disconnected. Clean or replace as needed.
• Test pressure switch: Ensure the switch clicks when gentle air pressure is applied (advanced users). Replace if it does not respond or tests out of spec.
• Re-test fill: After repairs, restore power and run a small load, monitoring fill level. The water should stop at the normal level and F08 should not reappear.

When to call a technician: Persistent overfill with good valves and pressure system may indicate a control board fault requiring professional diagnosis.