Whirlpool Gas Dryer keeps running on auto dry setting

If it works to begin with and fails afterwards then that can only be them solenoids mounted on the gas assembly. Here is my home video which shows how to check and replace:

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The timer is stripped inside and needs to be replaced. The cogged teeth are made of plastic and a tooth or two has broken off keeping the timer from moving while running

in auto the timer will not move if there is no heat,when the heat stops the timer moves,heat comes on timer doesn't move,when it's on auto make sure power is going down to the heating system,next time send model number and if it's gas or electric,good luck

If the timer advances to OFF and does not stop you have a bad timer. It could also be the cause of no heat. Replace the timer first. If still no neat replace the glow bar ignitor.

Auto sensor is not working. Replace it.

how well did you clean that duct, the duct is problem 90% of the time when the dryer does everything else, pretty much if the dryer heats and tumbles its doing its job

If you don't have heat the timer will not advance in auto dry. The first thing to check is the glow bar ignitor part number 279311.

Repairing a dryer that won't shut off many seem daunting, but fixing your own appliance is actually pretty easy. The toughest part is figuring out what dryer part is the problem. We've created a list of the most common parts that can cause a dryer to not shut off. Use this list to diagnose the problem you're having and then enter your model number into the search box to find the right part for you. You'll also be able to access even more detailed repair help and tips about your dryer.https://www.youtube.com/watch?v=rXs6cL_prAQ

If that is a 3 wire gas assembly then the timer is screwed.The orange wire when removed from the mix will make the thing advance. The trouble is in the timer. If that is a 2 wire gas operator you need to change the high limit and open up the outside vent. My opinion.

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hi thanks for the question ther is a thermostat on the air duct at the back of the dryer it has 2 wires at ends and 2 wires in the middle smaller ones this thermostat opens to turn off heat and the small wires on this thermostat when the heats shuts off then power goes to the timer and not before if it shuts off on timed dry timer is ok i would vacuum the dryer make sure all the vent right to the outside is clean as air flow restriction can cause this problem thanks the appliance doc