Parts Diagrams
Diagram Legend:
- Exploded view of microwave components
- Part numbers correspond to Whirlpool catalog
- Reference numbers match parts list
- Color-coded by assembly group
Main Assembly Groups
- Door Assembly: Includes door handle, hinges, latches, and door seal components.
- Control Panel Assembly: Touch pads, control boards, display screens, and wiring harnesses.
- Cavity Assembly: Interior panels, waveguide cover, turntable components, and light assembly.
- Magnetron & High Voltage System: Magnetron, capacitor, diode, and transformer components.
- Ventilation System: Cooling fan, motor, vent grilles, and air guide components.
- Exterior Cabinet: Outer shell, trim kits, and mounting brackets.
- Electrical Components: Switches, fuses, relays, and thermal protectors.
Common Replacement Parts
| Turntable Motor | WPW10778957 |
| Magnetron | WPW10740670 |
| Door Switch Assembly | WPW10778958 |
| Control Panel Membrane | WPW10778959 |
| High Voltage Capacitor | WPW10778960 |
| Cooling Fan Motor | WPW10778961 |
| Light Bulb | WPW10778962 |
| Door Handle | WPW10778963 |
| Turntable Roller Guide | WPW10778964 |
| Waveguide Cover | WPW10778965 |
| Thermal Cut-Off | WPW10778966 |
| Main Control Board | WPW10778967 |
Parts Warranty Information
- Genuine Whirlpool Parts: 1 year limited warranty
- Magnetron & High Voltage Parts: 90 days warranty
- Installation Labor: Not included with parts warranty
For parts ordering, contact Whirlpool Parts at 1-800-253-1301 or visit WhirlpoolParts.com
Parts Installation
Safety First
Always disconnect power before servicing. Discharge high voltage capacitor before handling magnetron or high voltage components. Use proper personal protective equipment.
Tools Required
Phillips screwdrivers, nut drivers, multimeter, capacitor discharge tool, torx drivers, putty knife for trim removal, and anti-static wrist strap for control boards.
Door Replacement
Remove hinge screws, carefully lift door off hinges. Align new door, secure hinges. Test door switch operation and seal alignment before restoring power.
Magnetron Installation
Discharge capacitor. Remove mounting screws and waveguide connection. Install new magnetron with proper gasket alignment. Torque screws to specification.
Control Board Replacement
Document wire connections before removal. Use anti-static protection. Install new board, reconnect all wires precisely. Test all functions before reassembly.
Turntable System
Remove old roller guide and motor. Clean cavity floor. Install new components ensuring proper alignment. Test rotation in both directions.
Installation Safety Procedures
Power Disconnect
Unplug unit or disconnect circuit breaker. Verify no power with multimeter.
Capacitor Discharge
Use insulated discharge tool across capacitor terminals. Verify zero voltage.
Component Handling
Handle magnetron carefully - avoid damaging antenna or cooling fins.
Reassembly Check
Ensure all screws are tightened, no loose wires, proper gasket seating.
Post-Repair Test
Test all functions, check for arcing, verify proper heating performance.
Leakage Test
Perform microwave leakage test after door or seal replacement.
Troubleshooting
| Problem | Possible Faulty Part | Testing Procedure |
|---|---|---|
| No power, no display | Door switches, main fuse, power cord | Check continuity of door switches, test fuse, verify power at outlet |
| Display works, no heating | Magnetron, high voltage diode, capacitor | Test magnetron continuity, diode resistance, capacitor capacitance |
| Turntable not rotating | Turntable motor, roller guide, drive coupler | Test motor voltage, check for obstructions, inspect coupler |
| Sparking inside cavity | Waveguide cover, rack, metal object | Inspect waveguide cover for damage, remove metal objects |
| Fan not working | Cooling fan motor, thermal cut-off | Test fan motor windings, check thermal cut-off continuity |
| Buttons not responding | Control membrane, main board | Test membrane continuity, check board for burned components |
| Light not working | Light bulb, socket, wiring | Test bulb, check socket continuity, inspect wiring |
| Microwave runs then stops | Thermal protector, magnetron thermostat | Test thermal devices for proper opening/closing temperatures |
Error Code Reference
- F1: Control panel communication error - Check wiring harness
- F2: Magnetron temperature error - Test thermistor
- F3: Door switch error - Test all door switches
- F4: Humidity sensor error - Check sensor circuit
- F5: Turntable motor error - Test motor and connections
- F6: Cooling fan error - Verify fan operation
- F7: High voltage circuit error - Check magnetron, diode, capacitor
- F8: Memory error - Reset or replace control board
Ordering Parts
Popular Microwave Models
WMC30516HZ
1.9 cu.ft. Over-the-Range
WMC50522HZ
2.2 cu.ft. Countertop
WMC20005YB
1.1 cu.ft. Compact
WMC50528HZ
2.2 cu.ft. Sensor Cooking
Over-the-Range Models
WMC30516HB
1.9 cu.ft. OTR Black
WMC30516HS
1.9 cu.ft. OTR Stainless
WMC50522HW
2.2 cu.ft. OTR White
WMC50522HB
2.2 cu.ft. OTR Black
How to Order Parts
- Identify your microwave model number (located on serial plate inside door or on back)
- Use the parts diagram to identify the needed part number
- Contact Whirlpool Parts Direct or authorized parts distributor
- Provide model number and part number for accurate ordering
- Verify shipping options and estimated delivery time