Microwave Not Heating? High-Voltage Diode WG01A01078 – Fix No-Heat Fast
A failed high-voltage diode is one of the most common and least expensive causes of a microwave that runs but produces zero heat. In most GE, Monogram, and Café microwaves, the diode converts AC power to DC to drive the magnetron — the component that actually generates heat. When the diode fails, the magnetron receives no power and the microwave hums, runs its timer, and lights up normally — but produces no heat at all. ⚡ Common failure point in GE-built microwave high-voltage circuits. Part WG01A01078 is the genuine OEM replacement that restores full heating power immediately.
❓ Is This the Right Part?
This is the correct fix if ALL of the following are true:
- ✔ Microwave powers on — display, controls, and interior light work normally
- ✔ Turntable rotates and fan runs during operation
- ✔ Door switches and interlock confirmed functional
- ✔ ONLY problem is no heat output on any power level
Not sure? Send us your model number — we'll confirm before you order.
🔧 Common Symptoms
- Microwave runs but food is not heated
- Loud humming during operation with no heat produced
- Microwave blows fuse or trips breaker repeatedly
- Burning or electrical smell from the high-voltage section
✔ If these symptoms match, this is the most likely failed component in the system.
✔ In most cases, replacing this diode restores normal heating operation immediately.
📦 Part Details
- Part Number: WG01A01078
- Type: High-Voltage Microwave Rectifier Diode — OEM GE / Monogram / Café
- Replaces: WG02F00393, 6851W1A002E, WB27X35382 — no modification required
- Brands: GE, Monogram, Café, Profile
The high-voltage capacitor (WG02F00228) works in tandem with this diode and fails at similar rates. If the diode has failed, the capacitor has likely been stressed. Replacing both in one visit eliminates the #1 cause of a repeat no-heat callback and saves a second disassembly.
⚙️ Installation
Skill Level: MODERATE — 20–30 minutes. Disconnect power and unplug the microwave before servicing. ⚠️ CRITICAL: Discharge the high-voltage capacitor fully using an insulated resistor before touching any components — it retains a lethal charge even when unplugged. Remove the outer cabinet, locate the diode in the high-voltage circuit near the capacitor and magnetron, disconnect the two leads, install the new diode observing correct polarity, and reassemble.
✓ Compatible Models
Confirmed compatible with CVM517P2M6S1, CVM517P2R1S1, CVM517P3M6D1, CVM517P3R1D1, CVM517P4M6W2, CVM517P4R1W2, CSB913P4N3W2, CVM517P2M5S1, JVM6172SK5SS plus additional GE-built models. Contact us to verify your model number before ordering.
💡 Pro Tip
The diode and capacitor are a matched pair in the high-voltage circuit — when one fails, the other has been stressed. Replacing both (diode WG01A01078 + capacitor WG02F00228) in a single visit costs less than a second service call and eliminates the most common cause of repeat no-heat failures in GE microwaves.
[FLAGGED] CVM517P2M6S1, [FLAGGED] CVM517P2R1S1, [FLAGGED] CVM517P3M6D1, [FLAGGED] CVM517P3R1D1, [FLAGGED] CVM517P4M6W2, [FLAGGED] CVM517P4R1W2, [FLAGGED] CSB913P4N3W2, [FLAGGED] CVM517P2M5S1, [FLAGGED] JVM6172SK5SS
✅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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