Make sure that the gas supply cut-off valve is fully open and that the dryer has an adequate gas supply provided to it.
Check the exhaust vent duct system for a clog or restriction. Check the flexible vent hose behind the dryer for a kink or clog. Make sure that the lint screen is cleaned before each cycle. Check the vent duct system to the outside of your home for restrictions. Make sure that the damper on the exit vent at the outside of your home is opening properly.
Your symptoms imply that the burner may be igniting the first time from a cold start but not reigniting on subsequent lighting attempts after the burner cycles off for the first time. If this is the case then you likely have weak gas valve coils.
The theory of operation for the gas valve assembly of this dryer is shown in the first image below. The second image shows how to remove the bottom front service panel on this type of dryer. If you can safely remove the bottom front service panel and start the dryer in a heated cycle, you can determine whether the ignitor is glowing and then cycling off to ignite the burner as described in the first image. If it is, then the gas valve coils (kit part 279834) will likely need to be replaced. You can order this part from the
website. NOTE: Be sure that you
unplug the dryer
and shut off the gas supply before accessing internal components. Replace the service panel as soon as you complete the brief test described above.
If you need to replace the gas valve coils and need more room to operate, you can remove the front panel using the basic procedure shown in the third image. You dryer will be slightly different that the one shown in that image. You will need to remove the bottom front service panel and unhook the door hinge springs before removing the front panel. Be sure that you
unplug the dryer
and shut off the gas supply before accessing internal components.
These tips may help you resolve the heating problem in your dryer. If you need more help, reply with additional details and we will assist you further.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services