Skip to main content

Microwave Drop-Down Door 20-Amp Blown Fuse


  • MDD 20-amp fuse blew
  • What causes the 20-amp fuse in the drop-down microwave to blow?


  • Misadjustment of switches
  • Control board faulty
  • Monitor switch faulty
  • Open circuit wire harness
  • Short circuit wire harness
  • High voltage capacitor
  • HV wiring
  • HV rectifier assembly
  • High voltage transformer
  • Magnetron


Turn the home circuit breaker to the unit off for 30 seconds then back on again. Then retest the unit operation.


If these steps do not resolve the issue, no further troubleshooting advice is available. Contact Factory Certified Service to schedule an appointment for repair


Need further assistance? Contact Customer Care at 800.222.7820 or provide your information below and request a Customer Care representative contact you.

Ask Your Question

We're standing by with answers

Whether you're shopping for appliances or have questions about those you already own, we've got the resources you need. Talk directly to a customer care expert at the Sub-Zero, Wolf, and Cove service center, or connect with an appliance consultant at an official showroom near you. Get quick answers online, or reach a certified service provider or installer. And much more.


Call us at (800) 222-7820