Haier Noisy high-voltage component or magnetron

Microwave makes loud buzzing or humming noise while heating

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.

Possible Causes

Failing magnetron, Loose transformer laminations, Defective high-voltage diode, Metal object or arcing in cavity

Safety: Unplug the microwave before inspection. Do not touch high-voltage components.

Check for metal or arcing: Inspect the interior for any metal objects, damaged waveguide cover, or burn marks. Remove any foreign objects.
Test with water: Place a cup of water inside and run for 30–60 seconds. If the noise is extremely loud or accompanied by burning smell or sparks, stop immediately and unplug.
Do not continue use: A failing magnetron or HV component can fail catastrophically. Arrange for professional service.

Professional Required 5/5

Magnetron / High-Voltage Transformer

Check Price on Amazon

We may earn a commission from links on this page.