For it all to work right you gotta have continuity on the limit and the control. AND the control must be cool. When it is cool it powers up the gas assembly. All of the items inside the gas assembly are powered at the same time. Those coils, the ignitor, and the flame sensor. The ignitor gets its power from the flame sensor and those coils. When it is stone cold it has a resistance value that will not allow the operating coils to work. In order for power to make them coils work the resistance in the ignitor must change. How does it do it? IF the ignitor is good AND the flame sensor is good, then power will start to heat the ignitor up to 1800f.
At that point the resistance in the ignitor has changed. The flame sensor bi-metal bends and kills power to the ignitor. With no flame detector and no ignitor in the circuit AND the resistance changed in the circuit, the coils now have enough energy to yank open the gas gates. The raw gas spews out on to the flaming hot ignitor and KaWhoosh Houston we have ignition! The gas remains on till the control gets hot enough (160f for cotton) in the drum then power is killed to the gas assembly. The drum turns round and round, the heated air moves across the damp clothes as they tumble away. If their are no air restrictions AND the control and thermal fuse is ok then when the drum cools down to around 105f the control kicks back in and tosses energy once again towards the Gas assembly. This cycle goes on all throughout the drying process.