Whirlpool Microwave door interlock microswitch WP3405-001034, Replaces 3405-001034

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✅ Cross Reference Information

Common Symptoms

• Microwave will not start with the door closed
• Microwave stops intermittently when the door is moved
• Microwave may run or fail to shut off because the door-interlock signal is incorrect
• Microwave may show no-heat symptoms when the interlock circuit does not engage

Check Before Replacing

• With the microwave unplugged, inspect the door hooks, latch area, switch holder, and actuator for visible damage, looseness, or misalignment.
• With the microwave unplugged and only if qualified to service microwave appliances, check the switch contacts with a multimeter while manually actuating the switch; the contact state should change consistently between actuator positions.
• Verify that the switch actuator is mechanically engaged by the door latch and that it clicks freely without sticking.
• Do not operate the microwave with covers removed or bypass any interlock switch. Microwave capacitors can retain a dangerous charge even after unplugging.

Pro Tip

Part Details

Installation Notes

• Disconnect power before servicing.
• Access is at the microwave door-latch/interlock assembly; the exact access procedure varies by model.
• Record wire locations before disconnecting them and reconnect each wire to the corresponding terminal.
• Ensure the actuator aligns with the door latch and operates freely after installation.
• After reassembly, verify correct door-interlock operation using the appliance-specific service procedure; do not operate the microwave if it runs with the door open or fails to stop when the door is opened.

Verified Compatible Models

AMC4080AAB, AMC4080AAS, AMC4080AAW, CM1012B, CM1012BXAA, CM1020B, CM1020BXAA, CM1022B, CM1022BXAA, CM1029B, CM1029BXAA, CM1229B, CM1229BXAA, CM1829A, CM1829AXAA

Fitment reminder: Match the complete appliance model number, including suffix or revision where applicable, before ordering.