The problem is the thermocoupler. it is the other small tube next to the pilot light. this tube sends a signal to the main valve to let the fuel go through. sometimes you have to change the whole pilot unit.
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Is it Propane check pilot light and if youhave gas make sure that you do notlight a flflame or cigerette if gas has been on without pilot light lit make sureto tthen gas line off clear place of fumes them turn gas on and relight pilot light
www.youtube.com/watch?v=BqYIWuDUZOUDec 12, 2008 - Uploaded by PatioShoppers
Great tips about troubleshooting your outdoor patio heater. ...Pilot Light Won't Stay Lit - How to Replace a Broken Thermo Couple on Furnace ...
Essentially all gas devices regardless of which gas used, are equipped with a thermocouple that monitors the pilot light's condition and if it fails, it will not permit the main flame to light or the pilot light to stay lit.
In your case, it may be that the TC failure also prevents the lighting of the pilot light.