Washer-dryer overfills or shows F04, may attempt to drain continuously.

Safety first: Unplug the appliance and turn off water supply.

Inspect pressure system:

• Locate pressure sensor: Usually mounted high on the side wall under the top cover, connected to the tub by a thin rubber hose.
• Check hose: Remove the hose from the sensor and tub nipple. Blow gently through it; it should be clear. If blocked, rinse with hot water and clear soap or lint buildup.
• Clean pressure chamber: At the tub connection, ensure the small port is not clogged with detergent residue. Use a small brush or cable tie to gently clear it.
• Inspect sensor and wiring: Check the multi-pin connector on the pressure sensor for corrosion or loose pins. Reseat firmly. Inspect wiring back to the control board.

Test: Reassemble, restore power, and run a rinse/spin cycle. If F04 persists, the pressure sensor itself is likely defective and should be replaced.