Check there is not a blockage in the line . Or get on to Weber and ask them if there is a problem with this model .
SOURCE: weber gas grill wont heat past 300 degrees
are the fire red , orange or blue?
must likely is the burner control.
check the air control at the back of the burner control, it should be open all the way.
it it is, then try another themostate.
SOURCE: low flame on burner...
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.
I had this problem with a brand new grill so it wasn't grease in the hose. Due to the new propane regulators you have to turn the propane tank on for at least a minute before turning the grill to light. Let the tank sit in the light position for five seconds and then you light the grill. This will keep air from getting into the intake hose and will keep your gas flame roaring high.
I was only able to get the grill up to 250 degrees before I found this fix posted on the Weber site. It is listed as the number one solution in the FAQ section.
SOURCE: can not light gas grill - Weber 8006 Have done all
Assuming that you have fuel and spark, check the following.
Mine did this, it was spiders, web and egg debris in the air inlet tube. It does not take much dirt to kill the ignition process.
If you have the perforated and hinged black plastic air inlet covers open them up and clean out the dirt. Reinstall the covers when done.
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