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Important thing to check when you regularaly get an F1 Fault.
The way the cabinets lock is due to a lid being drawn down via a little motor.gear unit onto the washer cabinet and a rubber seal ensures water does not blast out around the top edge.
Ensure the seal around the lid is sealing correctly. Of course that is not something you can see. So with the drawer open, run your finger around the seal and make sure the little lip in the rubber is even all the way around, clean and fully intact. The Seals can bend backwards and fail to to stop water being driven out under the lid. This allows water to drip down over the back of the washing drawer and flood the bottom floor and then set off your alarm.
Point number two, do not put any coating over the sensor. It works by sensing a small electric current between the sensor and the metal base of the machine. If you smear grease or paint any coating over that little strip of solder, it will fail to sense.