Customer Questions and Answers for Dryer Timer Control by Whirlpool

Michael, though it's possible, it's not likely the timer. The temperature/heat should be the same on both the auto advance and the timed dry settings. Your first check should be at the exhaust vent, make sure the vent pipe and the vent hood are not kinked or clogged with debris and lint. Then check all the thermostats for a "closed" circuit(s) at room temperature. If all's OK, you'll need to observe the burner operation for 15 or 20 minutes to make sure the gas valve coils 279834 are not weak and failing causing the dryer to not heat during the cycle.