If it is a propane mode, you can try replacing the regulator which is easy. If it is not the regulator, there is probably a blockage in the main burner jet. You have to take apart the head to get to the jet. If you are not comfortable doing this, have a service tech do it.
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If it is a propane mode, you can try replacing the regulator which is easy. If it is not the regulator, there is probably a blockage in the main burner jet. You have to take apart the head to get to the jet. If you are not comfortable doing this, have a service tech do it.