Grease filter
Metal grease filters catch cooking grease. Most can be washed; a bent or torn one should be replaced.
Convection element thermistor
No heat after a full cycle usually means a burned-out element.
Thermal cut-off
Replaces WB21X10046
Reads or limits temperature. A failed one can stop the heat or let it run too hot.
Magnetron
A motor that hums but won't turn, or stops once it's warm, needs replacing.
Halogen light bulb
The light bulb this model takes.
Micro-switch
Replaces WB24X10113
Door, lid and control switches stop a cycle when they fail.
Micro-switch
Replaces WB24X10112
Door, lid and control switches stop a cycle when they fail.
1Grease filterWB06X10309
2ThermistorWB18X10126
3Thermal cut-offWB20X10048
4MagnetronWB27X10309Part numbers come from the Sears PartsDirect parts list for the GE JVM1490BH02 (view the list), checked November 15, 2026 and AppliancePartsPros (source), checked November 6, 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.