[AZ Traveler]

If you look in the files section which is next to User CP in the second brown bar on the page there is a troubleshooting guide for the water heater. If you turned the water heater on even momentarily without water you likely burned out the element. They are inexpensive and easy to replace.

For the gas side you may have air in the line, run the stove for a couple of minutes to clear it out.