Thermal cut-off
Reads or limits temperature. A failed one can stop the heat or let it run too hot.
Capacitor
Replaces WB27X705
A motor that hums but won't start often needs a new capacitor.
Magnetron
Replaces WB27X10017
A motor that hums but won't turn, or stops once it's warm, needs replacing.
Switch
Replaces WB24X800
Door, lid and control switches stop a cycle when they fail.
1Thermal cut-offWB27X1127
2CapacitorWB27X10170
3MagnetronWB27X10735
4SwitchWB24X830Part numbers come from the Sears PartsDirect parts list for the Hotpoint RVM1325BW01 (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.