Tower High Voltage Component Overload or Arcing

Microwave makes loud buzzing or humming noise when running, louder than usual, sometimes accompanied by a burning smell.

Advertisements

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Advertisements

Possible Causes

Failing high-voltage transformer, shorted magnetron, arcing at waveguide cover, contaminated or burnt waveguide cover

How to Fix / Troubleshooting

Safety: Unplug the microwave immediately if you smell burning or see sparks.

User-level checks:

  • 1. Inspect interior: Look at the waveguide cover (usually a small mica or plastic panel on the side wall). If it is burnt, cracked, or has food splatter, it can cause arcing and noise.
  • 2. Clean cavity: Thoroughly clean the interior with mild detergent and water. Remove all food splatter, especially near the waveguide cover.
  • 3. Replace damaged waveguide cover: If the cover is burnt or damaged, replace it with a Tower-compatible waveguide cover before further use.

Advanced:

  • If noise persists with a clean, intact waveguide cover, the HV transformer or magnetron may be failing and should be tested and replaced by a technician.
Advertisements

Repair Difficulty

Medium 3/5

Required Part

Waveguide Cover
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements