In my 20 years in appliance industry, this is the most common problem with the dryer. Here is step by step check list.
1. Remove the vent from the back of the dryer and run the dryer, with towels, let it vent into the room. If the towels are dry in one cycle- you dryer venting is plugged with derbies. It could be full of lint or even a squirrel or bird nest. Call the furnace cleaner guy to blow your interior dryer vent or do it yourself. Remember, if your vent is too long, you will need the professional to do that.
2. If problem persists, it is most likely your high limit thermostat that needs to be replaced.
3. Before replacing the high limit thermostat, make sure your heating element comes on. The Kenmore models could use the double spiral element. Meaning that there are two heating spirals, one for the gentle cycle and one for the full heat. You may only have the gentle cycle part working.
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