Sencor Electrical coil or SMPS noise

Unit makes a high-pitched whine or buzzing noise from the control area.

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 or inductor on PCB, Loose mounting of PCB, Failing capacitor in power supply

Safety: Unplug the unit before touching internal components.

Steps:

Confirm source: Carefully listen to locate the noise (control board vs. compressor area).
Tighten mounts: Ensure the main PCB is firmly screwed down and not vibrating against the housing.
Board replacement: If the noise is from a buzzing transformer or inductor and is accompanied by instability, replace the main control board.

Medium 3/5

Main Control Board

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