Dryer was working fine and went on vacation for a week. Came home and the timer will not advance. Ran for a couple of hours before I noticed it, and the clothes were still damp. I started to troubleshoot it from online sources and done a variety of testing. I just replaced the igniter about a 2 months ago, and cleaned out the vent and hose, so I was pretty sure that wasn't the problem.

Finally, checked the hose and vent, and found a rabbit in the dryer. I was able to rescue the rabbit, and thought that was my problem, but the problem still exists.

Here is what I have done so far:
1. Checked vent and hose. Was blowing outside and melting snow around it.
2. Checked gas valve solenoids. Found this article and everything checked (link)
3. Clean lint filter and sensor
4. Tested continuity on the high limit thermostat out of circuit and tested good.
5. Tested continuity on the cycling thermostat out of circuit and tested good. Even put it on a griddle set at 220 and it triggered off at 220.

What else could cause this problem? It looks like the flame is coming on for a bit and then shutting off and repeats the process.

Thanks for the help!

Thanks for the response.

The timer did move and dryer worked when it was in timed cycle. Does this mean I need to investigate the sensor and/or wiring?

When the dryer is in auto the flame is going on and off during the cycle.

The dryer works fine in time cycle. If it is in auto cycle, the timer does not advance, the burner cycles on and off, but the clothes do not dry. They were still pretty damp after it ran for two hours.

I will dry disconnecting the blue wire and will report back on my findings.