If the gas range has weak flames even if it is set to HI, open and close the gas valve 3 to 4 times, remove the burner cap and burner head, and use a needle to poke the burner hole 5 to 10 times to clean out any debris.
In addition, check if any part of the gas hose is kinked or bent.
This guide was created for all models, so the images or content may be different from your product.