You want to make sure that the flame from the pilot is in the correct position, it may not be going through the hole in the pilot shield.
Since there are two flames on the pilot (one to heat the thermal-couple and one to light the burner) the port that lights the main burner, may be clogged. This means that you will have to clean your patio heater.
Option 2 It may be that the venturi tube or burner ports are clogged. Please see steps below to troubleshoot.
Gas pressure may be low. Turn cylinder valve OFF and replace cylinder.
There may be a blockage in the orifice or pilot tube? Bugs and spiders get into the pilot assembly, venturi tube and burner ports causing the unit to either not light or poor performance.
Clean the burner supply tube orifice by removing the burner supply tube nut. You will then be able to remove the orifice.
Check for leaks by using soapy water.
Note: Regular maintenance is critical to the successful operation of your patio heater.
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