Whirlpool Microwave Thermostat W10840013

The Whirlpool W10840013 Microwave Thermostat is the thermal cutout that monitors cavity temperature and interrupts the heating circuit if the microwave overheats. When this thermostat fails open, the microwave stops heating entirely or shuts down mid-cycle. Replacing it restores normal operation on compatible JMV8208, MMV4205, MMV4206, MMV5219, MMV5220, and YMMV4205/4206 series models.

Is This the Right Part?

Confirm the complete model number before ordering. Similar thermostats may have different trip temperatures, terminal configurations, or mounting positions that affect fit and function.

Common Symptoms

• Microwave stops heating mid-cycle and will not restart
• Microwave runs (turntable spins, light on) but produces no heat
• Microwave shuts off after a short time and feels excessively hot
• Microwave trips the internal thermal cutout repeatedly

Check Before Replacing

• Test the existing thermostat for continuity — a failed-open thermostat reads no continuity at room temperature
• Inspect the door switches — a faulty door switch can mimic a thermostat failure and prevent heating
• Check the magnetron and high-voltage diode — these can fail independently and produce identical no-heat symptoms
• Verify the vent fan and filters are clear — blocked airflow causes repeated thermal cutout trips without a faulty thermostat

Part Details

Installation Notes

1. Disconnect power before beginning — unplug the microwave or switch off the circuit breaker.
2. Discharge the high-voltage capacitor before touching any internal components — it retains a lethal charge even after unplugging.
3. Photograph the thermostat wiring and mounting position before removal.
4. Compare the replacement thermostat with the original — confirm terminal count, orientation, and trip-temperature markings match.
5. Reconnect wiring securely, reinstall the cover, restore power, and run a full heat test.

Microwave high-voltage systems carry potentially lethal voltage. If you are not experienced with appliance repair, use a qualified technician.

Verified Compatible Models

JMV8208CB1, JMV8208CB2, JMV8208CB3, JMV8208CB4, JMV8208CB5, JMV8208CB6, JMV8208CS1, JMV8208CS2, JMV8208CS3, JMV8208CS4, JMV8208CS5, JMV8208CS6, MMV4205DB2, MMV4205DB3, MMV4205DB4, MMV4205DE2, MMV4205DE3, MMV4205DE4, MMV4205DH2, MMV4205DH3, MMV4205DH4, MMV4205DS2, MMV4205DS3, MMV4205DS4, MMV4205DW2, MMV4205DW3, MMV4205DW4, MMV4205FB0, MMV4205FB1, MMV4205FB2, MMV4205FB3, MMV4205FB4, MMV4205FW0, MMV4205FW1, MMV4205FW2, MMV4205FW3, MMV4205FW4, MMV4205FZ0, MMV4205FZ1, MMV4205FZ2, MMV4205FZ3, MMV4205FZ4, MMV4206FB0, MMV4206FB1, MMV4206FB2, MMV4206FB3, MMV4206FW0, MMV4206FW1, MMV4206FW2, MMV4206FW3, MMV4206FZ0, MMV4206FZ1, MMV4206FZ2, MMV4206FZ3, MMV5219DE2, MMV5219DE3, MMV5219DE4, MMV5219DH2, MMV5219DH3, MMV5219DH4, MMV5219DS2, MMV5219DS3, MMV5219DS4, MMV5219FB0, MMV5219FB1, MMV5219FB2, MMV5219FB3, MMV5219FW0, MMV5219FW1, MMV5219FW2, MMV5219FW3, MMV5219FZ0, MMV5219FZ1, MMV5219FZ2, MMV5219FZ3, MMV5220FB0, MMV5220FB1, MMV5220FB2, MMV5220FB3, MMV5220FB4, MMV5220FW0, MMV5220FW1, MMV5220FW2, MMV5220FW3, MMV5220FW4, MMV5220FZ0, MMV5220FZ1, MMV5220FZ2, MMV5220FZ3, MMV5220FZ4, MMV5220FZ5, YMMV4205DB1, YMMV4205DB2, YMMV4205DB3, YMMV4205DE1, YMMV4205DE2, YMMV4205DE3, YMMV4205DH1, YMMV4205DH2, YMMV4205DH3, YMMV4205DS1, YMMV4205DS2, YMMV4205DS3, YMMV4205DW1, YMMV4205DW2, YMMV4205DW3, YMMV4205FB0, YMMV4205FB1, YMMV4205FB2, YMMV4205FB3, YMMV4205FW0, YMMV4205FW1, YMMV4205FW2, YMMV4205FW3, YMMV4205FZ0, YMMV4205FZ1, YMMV4205FZ2, YMMV4205FZ3, YMMV4206FB0, YMMV4206FB1, YMMV4206FB2, YMMV4206FW0, YMMV4206FW1, YMMV4206FW2, YMMV4206FZ0, YMMV4206FZ1, YMMV4206FZ2

Fitment reminder: Match the complete model number, including suffixes and revision digits, before ordering.