Why does the sensor light stay on?

Does your drum light cut on and off with the opening and closing of the door

Clean the vent all the way to the outside.
The dryer will take 4-5 loads to reset the filter sensor.

Mahe sure the vent is not smashed behind the dryer.

Check the ignitor underneath the drum. (You have to open the panel to see it) It should glow shortly after the dryer starts, then the flame starts and the ignitor shuts off. If the ignitor does not glow then it or the thermostat is bad. If the ignitor is glowing but the gas does not light then the flame sensor may have to be replaced. If the gas ignites but does not stay on either the flame sensor or the coils are at fault.
See also: http://home.howstuffworks.com/how-to-repair-a-dryer.htm
If everything above is OK then the thermostat or the auto sensor is not working correctly.

Check the ignitor underneath the drum. (You have to open the panel to see it) It should glow shortly after the dryer starts, then the flame starts and the ignitor shuts off. If the ignitor does not glow then it or the thermostat is bad. If the ignitor is glowing but the gas does not light then the flame sensor may have to be replaced. If the gas ignites but does not stay on either the flame sensor or the coils are at fault.
See also: http://home.howstuffworks.com/how-to-repair-a-dryer.htm
If everything above is OK then the thermostat or the auto sensor is not working correctly.

First thing to check is the ignitor underneath the drum. (You have to open the panel to see it) It should glow shortly after the dryer starts, then the flame starts and the ignitor shuts off. If the ignitor does not glow then it or the thermostat is bad. If the ignitor is glowing but the gas does not light then the flame sensor may have to be replaced. If the gas ignites but does not stay on either the flame sensor or the coils are at fault.
See also: http://home.howstuffworks.com/how-to-repair-a-dryer.htm

First thing to check is the ignitor underneath the drum. (You have to open the panel to see it) It should glow shortly after the dryer starts, then the flame starts and the ignitor shuts off. If the ignitor does not glow then it or the thermostat is bad. If the ignitor is glowing but the gas does not light then the flame sensor may have to be replaced. If the gas ignites but does not stay on either the flame sensor or the coils are at fault.
See also: http://home.howstuffworks.com/how-to-repair-a-dryer.htm

You dry by sensor???

Clean your sensor. The machine thinks the clothes are dry because the sensor is covered with who knows what???

Check your owner manual for the proper way to clean the sensor.

I hope this works for you

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First thing to check is the ignitor underneath the drum. (You have to open the panel to see it) It should glow shortly after the dryer starts, then the flame starts and the ignitor shuts off. If the ignitor does not glow then it or the thermostat is bad. If the ignitor is glowing but the gas does not light then the flame sensor may have to be replaced. If the gas ignites but does not stay on either the flame sensor or the coils are at fault.

Watch the burner assembly, shortly after starting the dryer the ignitor should begin to glow. If it glows for several seconds (up to 15 seconds) and then goes out, then the problem is probably the solenoids (coils). If the ignitor glows and stays on, then the problem is usually the flame sensor.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Gas dryer? First thing to check is the ignitor underneath the drum. (You have to open the panel to see it)  It should glow shortly after the dryer starts, then the flame starts and the ignitor shuts off.  If the ignitor is glowing but the gas does not light then the gas valve coils may have to be replaced.  If the gas ignites but does not stay on either the flame sensor or the coils are at fault.

Electric dryer? Temperature sensor has failed or heating element has burned out.