Cosori
Electrical Noise from Power Electronics
Unit makes a high-pitched whining or electrical buzzing noise when heating.
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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.
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Possible Causes
Vibrating transformer or inductor on main PCB, Loose mounting of control board, Slight coil whine from heater relay or components
How to Fix / Troubleshooting
Safety first: Unplug before opening the housing.
- Step 1 – Determine severity: A faint whine may be normal. Loud or changing pitch noises can indicate a failing component.
- Step 2 – Inspect control board: Remove the cover and locate the main control PCB. Gently press on large coils or transformers (with power off) to see if they are loose.
- Step 3 – Secure components: If a coil is loose, secure it with high-temperature silicone adhesive or replace the main control PCB.
- Step 4 – Monitor operation: If the noise is accompanied by flickering display, overheating, or erratic behavior, discontinue use and replace the board.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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