Thermal cut-off
Reads or limits temperature. A failed one can stop the heat or let it run too hot.
Vent motor capacitor
A motor that hums but won't start often needs a new capacitor.
Stirrer fan motor
A noisy or stopped fan means poor airflow and uneven temperatures.
Magnetron
Replaces WB27X10475
A motor that hums but won't turn, or stops once it's warm, needs replacing.
High-voltage capacitor
A motor that hums but won't start often needs a new capacitor.
Cooling fan blade
A noisy or stopped fan means poor airflow and uneven temperatures.
Turntable motor coupler
A motor that hums but won't turn, or stops once it's warm, needs replacing.
Micro-switch
Replaces WB24X10075
Door, lid and control switches stop a cycle when they fail.
Door interlock switch lever
Door, lid and control switches stop a cycle when they fail.
1Thermal cut-offWB27X10195
2Motor capacitorWB27X10170
3Fan motorWB26X10037
4MagnetronWB27X10735Part numbers come from the Sears PartsDirect parts list for the GE JVM1440SH01 (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
Open the door: the label is on the frame. Over-the-range models: sometimes behind the vent grille.