Ultrean
Electrical Noise from Power Supply or Fan
Air fryer emits a high-pitched whine or electrical buzzing sound during operation.
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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, Fan motor resonance, Loose metal shield or panel, Failing capacitor on power supply
How to Fix / Troubleshooting
Safety: Unplug the unit before opening the housing.
Steps to reduce whining/buzzing:
- Isolate source: Listen carefully to determine if the noise comes from the fan area or the control board area.
- Check fan: Clean the fan blades and ensure they are not contacting any guards. Tighten mounting screws.
- Inspect PCB: Remove the bottom cover and gently press on large components (transformer, coils) with an insulated tool while the unit is running (only if you are trained and extremely cautious). If pressing reduces noise, the component may be vibrating and the board should be replaced.
- Replace board or fan: Persistent electrical whine usually requires replacement of the main control board or fan motor.
Warning: Do not touch live circuits; if unsure, have a technician perform this diagnosis.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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