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was working ok but when the last load was put in dryer failed to heat

Model Number
DV448AE
What have you tried so far?

cleaned out the area below the filter with a vacuum – no change

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Hi Tom. If you feel comfortable taking the dryer apart, this will be necessary to complete the repair. In most cases there is a thermostat that sometimes blows. The fuse will blow if there is not proper airflow. It is very important to clean out any lint build up that may of built up over the years in the blower housing. UNPLUG UNIT FROM WALL BEFORE SERVICING. First you will need to pop the top of the dryer up by using a putty knife on the very left and right side of the door to prop the top of the dryer up on the hinges. Next there is 2 screws holding on the front of the unit on the left and right side of the front panel. After removing the front panel you will need to remove the drum by reaching back under the drum and releasing the tension on idler pulley and removing the belt. Remove the drum. Next you will need to inspect the thermostat and check it for continuity. There may be a few different fuses to checks. If thermostat is OK, Check the heating element. Using a multimeter set to ohms, check element for continuity.
Attached is links to both the element and thermostat. If you have any other questions, feel free to ask.
Thanks! Tony-AceTech52

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