Water heater EE3J40RD045V is not making hot water, not enough hot water. Reset controler and got 3 flashes indicating sensor failure. Over the last 2 hours the temp has come up, not to the set point. The reset has been hit a couple more times and I got 15 blinks, 13 blinks and right now it is just blinking nonstop. Sensor? Controller? Going to check connections.