What parts fit the Whirlpool MT3090XAB0?

Magnetron thermostat WP4375079, High-voltage capacitor WP4375020, Magnetron 4375072, Fuse WP4375321.

Whirlpool MT3090XAB0 microwave parts

Magnetron thermostat

Reads or limits temperature. A failed one can stop the heat or let it run too hot.

Shop the thermostat on Amazon Other models that use WP4375079

High-voltage capacitor

A motor that hums but won't start often needs a new capacitor.

Shop the capacitor on Amazon Other models that use WP4375020

Magnetron

A motor that hums but won't turn, or stops once it's warm, needs replacing.

Shop the magnetron on Amazon Other models that use 4375072

Fuse

Reads or limits temperature. A failed one can stop the heat or let it run too hot.

Shop the fuse on Amazon Other models that use WP4375321

1ThermostatWP4375079

2CapacitorWP4375020

3Magnetron4375072

Part numbers come from the Sears PartsDirect parts list for the Whirlpool MT3090XAB0 (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.

Other Whirlpool microwaves

MH9180XLTMH9181XMBMH9181XMQMH9181XMSMH9181XMTMT2110SJB0MW8900XS5UMV1160CBUMV1160CSUMV1160CW