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Orange flame is not enough air in the gas air mix. You have a spider nest living in the venturi tube and nozzle. Weber sell a special brush. The venturi tube is between the gas control knob and jet and the burner.
Open Stovetop
On most stoves, the air shutter is just behind the burner gas valve. It is a sliding plate or tube that covers the burner air vent. Loosen the set screw that keeps the shutter from moving. Turn the burner on fully and slowly open the shutter until the flame turns blue https://homeguides.sfgate.com/causes-burner-flame-gas-stove-yellow-82498.html
turning the knob adjusts the flame intensity
it is not doing that and the flame is very low
low gas in the cylinder
regulator
blocked jet for the burner
you may have to remove the burners and clean the inside of them. they could have insect webs inside preventing the flow of gas. hope this helps. also, try opening the tank really slowly.
if using the adapter hose for large tank weber has had problems with hose call weber and get new one or call bbq galore and ask for a 4ft. adapter hose 214-696-0030
Remove the burner and check the flexible tubes for kinks or blockages. The flexible tubes usually just slip over the backs of the valves. Spiders love to get in there and block them. Also check that the holes in the burners are not clogged. Be careful when reseating the flexible tubes to be sure that they are properly seated on the back of the valves. Failure to properly seat the flexible tubes can cause leakage there, and the gas can ignite at the back of the valves and not reach the burner. Be certain that the replacement burner is designed to use with your grill and the flexible tubes mate properly with the back of the valves.
Try looking for webs back to where the burner tube meets the valve.
Otherwise you need to remove burner tube to access back of valve to clean with a torch tip cleaner or compressed air, (remember to disconnect grill from gas source first) inside valve orifice. Usually the back of valve can be removed with a wrench.
Worst case you always get a new valve off internet if you can't resolve the plug.
Hope this helps, good luck.
Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)
Check the gas pressure, make sure you are getting 11 to 14 PSI.
You need that after the regulator all the way to the manifold.
Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.
Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.
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