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One DIY repair that you can check for is -
Turn dryer on to timer setting and start dryer. Look inside on left lower side. You can turn lights off to see better. You are looking for the igniter to glow orange. If you can see inside and you do not see the igniter glow you would replace igniter. If it glows for 40 seconds and turns off you replace the radiant sensor.
It looks like part number 4 on this diagram -
Sometimes the igniter is the problem even when it does glow orange. You would check it with an amp meter to be sure in that instance.
You may have to remove the front acces panel to do the above check.
I do think it pretty straight forward. However, if you get into something that you need some more information on you can post back at this question and we will answer (no additional payment needed).
Follow the guidelines and (if you do it yourself) let me know when what you find. I don't want you to order the part until we're real sure it's the one.