The wiring diagram for your dryer is illustrated in the first image below. In the automatic cycle, the advancement of the timer will use the neutral path through the thermal fuse and gas valve assembly (timer switch 0 will be closed from TM to OR). A blown thermal fuse or problem with the gas valve assembly circuit could prevent the timer from advancing properly in the automatic cycle. To accurately test the timer, use the timed cycle to see if the timer advances properly.
Since the dryer is not heating at all, I recommend checking the thermal fuse first. To check this component, follow these steps:
- Unplug the dryer to completely disconnect electrical power.
- Turn off the gas supply to the dryer.
- Remove the back panel of the dryer.
- Locate the thermal fuse (Key 39 in the second image below) on the blower housing.
- Pull the wires off of the thermal fuse.
- Using a volt/ohm meter, measure the resistance across the leads of the thermal fuse.
You should measure near zero ohms if the thermal fuse is good. If you measure infinite resistance (open), then the thermal fuse is blown and will need to be replaced. If the thermal fuse is blown, you will need to check the venting of your dryer. Make sure that the exhaust venting is not restricted. This could be causing problems in the dryer and would also cause the thermal fuse to blow.
If the thermal fuse is okay, then you could have weak or failed gas valve coils that are preventing the dryer from heating properly. The third image below explains the operation of the gas valve assembly in your dryer. Understanding this process could help you determine the heating failure that you are experiencing in this dryer. I would need to know more details to help you further with this problem. I recommend checking the issues described above and resubmitting your question with more information if you need more technical help in resolving this heating problem in your dryer.
To view a parts list diagram of your dryer and order parts, you can visit, www.searspartsdirect.com.