Our clothes dryer is heated by gas. There are very few parts to the mechanism, and when the dryer stopped heating, I did a bit of research to learn how to diagnose the failure.
With all other easily-tested parts proven as working, the solenoids controlling these two gas valves became the suspected cause. The Sears parts depot had replacements at reasonable cost, and what a joy it was to hear it fire up once all the bits were put back together!
For those who might wonder how it works: when the dryer is commanded to heat, and the ambient temperature in the drum isn't too high, and the ignitor is sufficiently hot, then a pair of coils (solenoids) is energized, magnetically forcing this pair of valves to open, letting gas flow.
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