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This sounds elementary but are you sure we have gas to the heater? Gas cock and gas valve both in ON position?
Yes that is correct. Since pilot is lit that does indeed verify the gas is on to the unit. Next how about the knob on the gas valve.Verify for me it is not till in PILOt position but is turned to ON
Yes I am trying to see the valve positions as related to a clock. There should be a mark on the valve that the positions, Off, Pilot and ON line up with to show what position it is in.
If valve is in ON position we can move to actual troubleshooting. The most common cause the burners not to light is the pilot generator not producing enough mili volts to open valve.We will need a multi meter that reads DC millivolts to check this.
Below is a link to a video showing you step by step how to check the thermopile. We will go from here.