Sage Switch‑mode power supply noise / coil whine

Unit emits a high‑pitched whining 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 control PCB, Loose ferrite core, Aging electrolytic capacitors, Poor PCB potting or damping

Safety first: Unplug before opening the control housing.

Identify source: With the cover off (and extreme caution if testing live), localize the noise to a specific component on the board.
Non‑invasive mitigation: Ensure the board is firmly mounted and not resonating against the housing.
Component replacement: If the noise is accompanied by instability or overheating, replace the main control PCB. Coil whine alone is usually not dangerous but can be annoying.

Hard 4/5

Main Control PCB

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