Chefman Transformer / Power Supply Hum

Unit emits a buzzing or humming noise even when not actively 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

Vibrating transformer on control board, Loose mounting screws, AC line noise, Failing power supply component

Safety first: Unplug before opening the housing.

Confirm source: Listen closely to locate the noise; it often comes from the control board area.
Tighten mounts: Tighten screws securing the control board and any small transformer to reduce vibration.
Inspect components: Look for overheated or loose components on the power supply section. Replace the control PCB if humming is accompanied by heat or odor.
Electrical supply: Try a different outlet to rule out line noise.

Medium 3/5

Main Control PCB

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