Upon arrival the unit was cycling through operations correctly but gas would not exit the gas valve when the igniter would spark. Gas was checked for at the gas valve and gas union, there was not any gas. Upon searching the building, it was discovered that there was a gas shutoff valve near the roof access room that had been turned off not allowing gas to enter the unit. The valve was opened and the unit was tested. The unit is operating correctly at this time. Payment still needs to be collected.