Hi, I have a commercial Hobart dishwasher/sanitizer. Model LX3D (or O)N. All of sudden, it started draining in the wash/sanitizing cycle. The machine fills when you turn it on and then it drains when you push wash and then it fills again when the wash cycle is done. Therefore, the water is not spraying through the arms to wash/sanitize the dishes. Do you have suggestions on how to fix this?