High-limit thermostat
Controls the heat. A dryer that runs too hot or won't heat points here.
Drum belt
Replaces WE12X21574
Turns the drum. If the motor hums and the drum stays still, check the belt first.
Drum glide bearing, upper
Replaces WE3M52
Thumping or squealing during a cycle points to worn rollers, pulleys or bearings.
Push-to-start switch
Door, lid and control switches stop a cycle when they fail.
Operating thermostat
Controls the heat. A dryer that runs too hot or won't heat points here.
Idler pulley
Replaces WE12X20395
Thumping or squealing during a cycle points to worn rollers, pulleys or bearings.
Door switch
Door, lid and control switches stop a cycle when they fail.
1ThermostatWE4M137
2Drum beltWE03X29897
3Glide bearingWE03X37320
4SwitchWE4M416Part numbers come from the Sears PartsDirect parts list for the Hotpoint HTDX100ED5WW (view the list), checked November 15, 2026. Amazon buttons open a search for the part number; we may earn a commission.
Where the model number is
Inside the door opening, on the frame or the back of the door. Older models: on the back panel near the cord.