Disconnect the dryer from its electrical source before troubleshooting. Unplug the appliance from the wall outlet of flip the circuit breaker switch that corresponds to the dryer's off position. Shut off the supply of gas to gas dryers.
Check to ensure there is sufficient airflow in the room where the dryer is kept. Open a window or leave the laundry room door cracked to help prevent the appliance from overheating.
Remove and clean the lint filter. Wash the filter in warm, soapy water if it's particularly dirty. Check the lint filter housing for trapped lint and clean if necessary. Clean out the lint filter after each use to prevent it from building up lint in the lint filter housing.
Detach the exhaust hose from the back of the dryer and check it for kinks or obstructions. Rinse out the inside of the hose if necessary to remove built-up grime or lint. Allow the exhaust hose to air dry before reattaching it to the dryer.
Clear the outside exhaust vent of lint, leaves, birds' nests or other obstructions that might prevent heat from escaping. Check this vent often to ensure that it remains clear.