Joe: ..Your post didnt say if it was a Quick Recovery model (Two Elements) ?Be sure that the little red button is pushed in…. If it has two elements, the yellow and blue wires go to the upper element, and the black and red to the lower element. If you have 220 volts going to the upper element, it should heat, if it doesnt….change the upper element. If you have 220 volts going to the bottom element and no hot water…change the lower element. If your not getting 220 volts to your heater…check the breaker in the breaker box.Bud