Tristar
Electrical Noise from Transformer or Relay
Oven emits a high-pitched buzzing or humming noise from the control panel area.
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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 control transformer, Chattering relay due to low voltage, Loose mounting screws on PCB components
How to Fix / Troubleshooting
Safety first: Turn off power before removing the control panel.
- Identify source: With the panel removed and power briefly applied (only if safe and insulated), carefully listen to locate the buzzing component (transformer or relay).
- Tighten mounts: Disconnect power and tighten any loose screws or clips securing the transformer or relay to reduce vibration.
- Check supply voltage: Ensure the oven is on a stable circuit; low voltage can cause relay chatter.
- Replace noisy component: If the noise is excessive or accompanied by malfunction, replace the main control PCB or the specific transformer module if separately replaceable.
Mild humming can be normal, but loud or new noises warrant inspection.
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Repair Difficulty
Hard
4/5
Required Part
Main Control PCB
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