Weber · Spirit Grills
If the grill only reaches a low temperature range (250°-300°F) even when set to high, there may be a problem with gas flow or obstructions in the burner system.
Click steps to track your progress.
Reset the excess gas flow safety device by turning off the LP tank valve and all burner control knobs, waiting five minutes, then restarting.
Check if the LP fuel tank is low or empty and refill it if necessary.
Inspect the fuel hose for any bends or kinks and straighten it carefully.
Clean burner ports that run along the entire length of the burner tube.
Inspect and clean the spider/insect screens for possible obstructions.