Mary G San Mateo , CA September 22, 2025 Appliance: Whirlpool Microwave/Hood Combo WMH53521HV4 Whirlpool Microwave/Hood Combo Wmh53521hv4: Microwave quit working it had power but did not heat anything. How to replace Magnetron (Microwave). Took it apart, replaced the magnetron and diode Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours