The Hi and Lo gas valve coils do they work in tandem ? Does the Lo stays on all the time ? Ruy Corona ,Ca

Their is 2 coil hosing but one of them has 3 wires and 2 coils inside it. The ignitor does 2 jobs, it lights the fire and acts as a thermocouple through the holding coil. If the flame does not ignite after the sensor detects the heat from it and shuts down then once the ignitor cools down the gas valve is shut down even if power is going to the gas valve. When the temp drops below 105f in the drum the control closes contacts inside allowing power to be supplied to the gas assembly. The ignitor and flame sensor along with the booster holding and secondary coils are all energized at once but the solenoids won't open the valve because the ignitor is hogging the power. The power supplied to it runs through the flame sensor. When the temp inside the sensor reaches a point the bi-metal inside tripped the power to the ignitor and the power gets diverted over to the secondary coil. Thr flame stays on till the temp inside the drum reaches 160f at which time the control thermostat opens circuit to the gas assembly and power is shut down. The drum continues to tumble and when the temp drops once agin below 105 the process is repeated and another blast of heat is shot into the dryer. So what goes wrong? Faulty flame sensor sticking/open, cracked ignitor, old coils that work intermittently or not at all when hot but work again when cooled. More here.

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