Proline Abnormal Noise – High Voltage or Mechanical Interference

Microwave makes loud buzzing, humming, or crackling noises when heating.

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 magnetron, Arcing at waveguide cover, Loose turntable motor or fan, High-voltage transformer vibration

How to Fix / Troubleshooting

Safety first: If you hear loud crackling or see sparks, stop the microwave immediately and unplug it.

User-level checks:

  • Inspect the waveguide cover (mica plate on the side or top interior) for burns, holes, or food splatter. Clean gently with a damp cloth; if damaged, it must be replaced.
  • Ensure no metal objects or foil are inside the cavity.
  • Check that the glass tray and roller ring are seated correctly and not rubbing.

If noise persists without visible arcing:

  • The magnetron, HV transformer, or internal fan may be failing. These require professional diagnosis and replacement.
Advertisements

Repair Difficulty

Hard 4/5

Required Part

Waveguide Cover
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements