Gas Dryer Ignition System, 
Newer 'M' Style Valve

Here's a diagram of a common dryer ignition system that uses what we call the 'M' series gas valve. Burner shapes vary depending on brand.

Use an ohmmeter to measure the resistance of the 3 valve coils:

If resistance readings are outside these ranges, replace the coils. 
Wholesale cost is under $10 for the set here: Whirlpool part #279834

They're easy to replace because, unlike previous versions, the coil wires plug onto the coils with quick-disconnects. I've changed many of them and have yet to replace even one of the valves as an assembly. Other than coil failure, this valve's been very reliable.

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