Whirlpool Harness Conv GM / Harns-Wire (microwave wire harness assembly) W11578578
Genuine Whirlpool wire harness assembly used in Whirlpool-built microwave and microwave-oven-combination appliances, including JennAir and KitchenAid models.
❓ Is This the Right Part?
This is the correct fix if ALL of the following are true:
- ✔ Your microwave is a Whirlpool or JennAir JMC or JMW series built-in model
- ✔ The microwave loses power intermittently or certain functions stop working unpredictably
- ✔ The control board and door switches have been tested and confirmed functional
- ✔ Visible wire damage, burned connectors, or loose harness connections have been identified
- ✔ ONLY problem is intermittent power loss, inconsistent heating, or specific function failures tied to wiring
Not sure? Send us your model number — we'll confirm before you order.
🔧 Common Symptoms
- Microwave loses power intermittently — works sometimes, dead other times
- Inconsistent heating — magnetron runs but output varies cycle to cycle
- Specific functions stop working — turntable, light, or fan operates but heating doesn't
- Burning smell or visible scorching near wire connectors inside the unit
- Microwave trips the circuit breaker or GFCI outlet repeatedly
- Display works but microwave won't heat — control board commands not reaching magnetron
✔ If these symptoms match and wiring damage has been identified, this is the correct replacement harness.
✔ In most cases, replacing this wire harness restores reliable electrical continuity and normal microwave operation.
✅ Cross Reference Information
Part Number: W11578578
Previous Part Numbers: W11555168
Part Details
- Part Number: W11578578
- Part Type: Harness Conv GM / Harns-Wire (microwave wire harness assembly)
- Manufacturer: Whirlpool
- Appliance Type: Microwave
⚙️ Installation
Skill Level: Advanced — 45–60 minutes. Disconnect power at the breaker and allow the microwave to sit unplugged for at least 5 minutes before opening — the high-voltage capacitor inside a microwave can retain a lethal charge even after power is removed. Route the new harness following the same path as the original, connecting each plug to its matching connector one at a time. Do not power on until all connectors are fully seated and the cabinet is reassembled.
Verified Compatible Models
JMW2430LM02, JMW2430LM00, JMC2430LM00, JMW3430LM03, JMW2427LL02, JMC2427LM00, JMW2427LL00, JMW2430LL02, JMC2430LL00, JMW3430LL03, JMW2430LM03, JMC2430IL15, JMC2427LL00, JMW3430LM00, JMW3430LM02
Model Families: JMC2427, JMC2430, JMW2427, JMW2430, JMW3430
Fitment reminder: Match the complete appliance model number before ordering.
🔗 Model Hub Pages
No model-specific hub pages linked yet — contact us with your model number and we'll point you to the right parts breakdown.
💡 Pro Tip
Microwave high-voltage capacitors can store up to 2,100V DC and retain that charge for hours after unplugging — contact is potentially fatal. Before touching any internal component, discharge the capacitor using an insulated screwdriver across both terminals. This is a non-negotiable safety step that applies to every internal microwave repair, including wire harness replacement.
✓ Model-Specific Repair Pages
✅Compatibility & Cross Reference
Not sure about your model number? Call 1-877-899-7278 and we’ll help you confirm. All brand names are the property of their respective owners and are used for compatibility reference only.
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