My LG washing machine, model WF-764STP is giving an HE error. The book says it is the water level sensor. Where do I find this and how do I repair it. Thank you

If you take the top of the unit, you will find it strapped to the side of the chasis about level with the top of the drum. Ots white and round, about the size if a child's palm. YouMAY find that removing the unit, blowing down the plastic feed pipe and then putting the unit back fixes your problem. My personal experience with these things though is that once they fail they call all sorts of problems. Very nice of your machine to warn you. It's not unusual for these things to fail in a manner that just tells the machine that there's not enough water and they just fill and fill and fill until water comes out of your soap drawer!

Needless to say therefore, if you do remove and refit, or even if you buy a new one to fit.... WATCH the machine for the first couple of loads and make sure that it's not under or over filling before you walk away and leave it to its own devices.