The microwave operates normally but fails to heat food, indicating a high-voltage circuit fault. Here are the common causes identified by our Xiaoyijiang technicians: \n\n1. Blown High-Voltage Fuse: The most frequent issue caused by overloads or component shorts. Replace with an identical fuse, but first investigate the root cause of the short. \n\n2. Magnetron Aging: The core component that generates microwaves, typically lasting 2000-3000 hours. As it ages, output power drops until it stops working entirely. \n\n3. High-Voltage Diode Failure: Causes a secondary short in the transformer, blowing the fuse. Use a multimeter to test. \n\n4. High-Voltage Capacitor Failure: Reduced capacitance or leakage affects microwave output. \n\n5. Door Interlock Switch Malfunction: A door that doesn't seal properly or oxidized contacts trigger safety shutdowns, cutting high-voltage power.\n\nSafety Warning: Microwave interiors contain high-voltage capacitors that can retain lethal charges even after being unplugged. Do not attempt disassembly unless you are a qualified professional. Xiaoyijiang repair technicians are fully trained and ensure your safety. Call us at 400-1060-908.
Need home appliance repair services?
Professional technicians on-site quickly, transparent pricing, and repair warranty.