Here are some tips that should help you with this problem:
If you did not clean the lint screen with water and a soft bristle brush, then I recommend that you wash it in this manner and allow it to dry completely. A build-up of fabric softener could inhibit air flow through the lint screen.
Make sure that the damper on the outside vent exit of the exhaust duct system to the outside of your home is opening properly. A restriction in the exhaust vent duct system could prevent the dryer from heating properly.
Ventilate the laundry room as much as possible. Remove the flexible exhaust vent from the back of the dryer and position it so that you can check the temperature coming out of the back of the dryer. Fill the dryer with a medium load of wet laundry. Start the dryer on a timed cycle with high heat. Check the temperature of the air coming out of the middle of the exhaust vent in the back of the dryer with an accurate thermometer. If the dryer still does not heat at all, I recommend that you
and check the resistance of the thermistor (temperature sensor) as shown in the image below. At room temperature, the resistance of the thermistor should be about 10K ohms (10,000 ohms). If the resistance of the thermistor is okay, then you likely have a problem with the main electronic control board (part 8546219). You can order this control board from the
Unplug the dryer
before accessing internal components.
If the dryer heats properly while venting directly into the laundry room then an undetected restriction in the exhaust vent duct system to the outside of your home is likely causing your heating failure. You may need to examine and clean that system more thoroughly.
These tips may help you resolve this dryer problem. If you need more assistance, reply with additional details.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services