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good evening, if this igniter is glowing but theres no flame the issue is the gas valve coils. these coils are what opens the valve, they get weak and fail. these are inexpensive and easy to install. you can fix this yourself . heres a link to the parts. http://www.repairclinic.com/PartDetail/Gas-Valve-Solenoid/279834/3479?modelNumber=DG412?RCAID=1000065 they are around $22.00, there's also a video at the same link to show you how to replace them. thanks and have a great night, Bryan
i have tapped then and the dryer started to heat. should both be replaced?