High-limit thermostat
Replaces 4451442
Reads or limits temperature. A failed one can stop the heat or let it run too hot.
Blower
Replaces 4451744
A noisy or stopped fan means poor airflow and uneven temperatures.
Magnetron
A motor that hums but won't turn, or stops once it's warm, needs replacing.
Baseless lamp
Replaces 4375348
The light bulb this model takes.
Door interlock switch
Replaces 4375346
Door, lid and control switches stop a cycle when they fail.
1ThermostatWP9759243
2BlowerWPW10016550
3Magnetron4375072
4Baseless lampWPW10440740Part numbers come from the Sears PartsDirect parts list for the KitchenAid KEMS377DBL6 (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 oven door: the plate is on the frame or the side trim.