when you fill the tank be sure to fill the tank with water until all air comes out of the tank and faucet. If you don't do this you will dry fire the tank which will burn out the electric element. Disconnect all electric to the tank. With a ohm meter check the the element terminal to terminal there should be a reading if the element is good. No reading would be a burn element. Than from each terminal to the tank body there should be no reading. Do both terminals. Put the meter on 120 volt ac scale, turn on power to the tank there should electric to the thermostat. Most likely the heater is burnt. check it before buying parts
