My Roper gas dryer auto timer has stopped working. The timer works on the timed setting. The clothes seem to take forever to dry also. There is not much heat. At times the air feels warm when I check the vent outside but usually it is cool. I have cleaned the lint trap, vent and vent hose. I also checked the thermal fuse as that had gone out a couple years ago, but it tested fine.
While the dryer is running I can see a glow under the drum every minute or so for about 5 seconds.
Any ideas as to what else to check or where to go next?
Any suggestions are helpful

Simon,
I cleaned the vent hose, there is no blockage from hose to outside. I can stick my arm out the hose to the outside of the house. I also took the chute off and cleaned it. I can find no air restriction. The air blows fine out of the vent, which is why I am stumped.
I am trying to take the thermostat off to test it, but I cannot get the leads off of it to test it, any suggestions?

Hi,
Just wanted to let you know that I got the dryer working. It turned out the coils on the gas valve were bad. I changed them out and it is now working. Thanks for the help though.