Turn breaker power off. Verify now power to unit with volt meter. Most systems have in line over temp over current to protect circuit board and motor. Also the water level switch must be made to complete interlock condition. Check the heater coil for continuityas it may have opened. Check heater for continuity to each coil set. There is an interlock that is for diagnostics on start up that will prevent unit from starting. Look for any melted wires or components too. Always know and verify breaker settings. Verify your meter with known voltage reading first. Be safe my friend.
