I posted a question on the Appliance Pros forum and quickly received responses saying that the problem was likely the flame sensor. I ordered a flame sensor from Appliance Pros and it was delivered in less than 36 hours. I replaced the old part and the dryer is now working fine. This isn't the first time that I received help from Appliance Pros. It's so good to know that there are experts who can help me diagnose appliance problems. I really appreciate it.