Non heating WP Built Gas Dryer
Is there voltage at the gas burner ? if yes
Does the igniter heat ? If no the heat sensor is probably open.
If the igniter heats and cycles off on the heat sensor in about a minute you have a bad set of valve coils, Replace valve coils.
There is a very small chance you have a bad gas valve, although this seldom happens on a WP built dryer, 90% of the bad gas valves we see are on MT dryers.
Also I am assuming you have gas at the valve assembly.
John L.