Turn the thermostat down to the lowest position with the down arrow located on the right side of the display panel.
Turn off the power to the water heater with the green switch located on the left side of the display panel and wait five minutes. This clears out any gas buildup inside the unit. Again, if you smell gas, contact the installer or your local fire department. If you do not smell gas, proceed.
Turn on the unit via the green switch and raise the temperature of the water with the up arrow to your desired temperature.