Check the small mesh filters inside the valve inlets for debris. Mechanical failure (valve stuck open).
Because these specific service parts can sometimes be discontinued or "out of stock," it is best to check with authorized retailers: lg 3850ea3100w
No lights on the display panel, no chime sounds, and no response when pressing the power button. If you have confirmed power at the outlet and the power cord is intact, the main board is the prime suspect. Check the small mesh filters inside the valve