Troubleshooting your Dynasty gas grill when burners aren't getting gas
First, check the tank's propane level to make sure the tank has gas. Next, reset the pressure regulator to restore gas flow through the regulator if the regulator's flow-limiting device tripped. Replace the pressure regulator if it doesn't allow gas to flow to the manifold after resetting the flow-limiting device. Check the operation of the burner valves on the manifold and replace the manifold if gas doesn't flow properly to the burner tubes when you open the manifold's valves.
Gas won't flow through misaligned burner tubes, so check and adjust burner tube alignment with the gas valves. Clogs in the burner tubes can also inhibit gas flow through the tubes. Clean clogs such as spider webs and spills from the burner tubes to restore gas flow through the tubes.
How to fix your Dynasty gas grill when some burners won't light
When one or more burners won't light, clogs in the non-working burner tubes are often the cause. Remove the grates and the flavor bars and check the non-working burner tubes for clogs such as spider webs inside the burner tubes. Check the ports on the sides of the burner tubes for clogs as well, or for damage.
If the grill has an igniter for each burner, look for cracks in the ceramic insulators of the igniter electrodes that can cause the electrodes to fail. Check wiring connections on the igniters. Reconnect any loose wires and repair any broken wires.
Test the ignition module and replace the ignition module if it isn't sending spark current to the affected burners.
A failed grill manifold could also prevent some burners from lighting. Replace the manifold if it doesn't allow gas flow to the affected burners when you turn on those burners' gas valves.