I have a Frigidaire FGR231AS1 gas dryer that will only light after sitting until cold. The burner will light normally only one time. After the dryer heats, it will turn off the burner, but it will not light again. I can see that the igniter is heating every minute or so after it cools a bit, but the gas doesn't seem to be coming on after it shuts off the first time. If I let the dryer sit for 40 minutes or so, the cycle repeats.

Here are some tests I have tried:

Manually heated both the temp sensor (the one on the duct, near the fan) and the over-temp sensor (near the back of the drum).
Both of these sensors audibly clicked and continuity was broken.

I did a similar test on the flame sensor.

It does not matter whether timed dry or automatic dry is selected. The symptoms exist for all settings.

Any help would be appreciated.