Hi thanks for the question.
When you first use the dryer does it heat for the first few minutes.
The problem is with these gas coils. They will only work when the dryer is closed.
They are located on the gas valve at the front of the dryer.
The coils are only $ 20.00. To buy .
Its worth it for sure.
Your watching this with the drum out.
Does the gas ignite.
It is the coils thar are bad.
Replace the coils.
Yes I am .Its the problem.