Garage door opener operates normally but there is a noticeable electrical buzzing or humming from the head unit.

Safety first: Unplug the opener before removing the cover. Do not touch exposed mains connections.

• Identify source: With the cover removed and power briefly restored (only if you are comfortable and safe), listen carefully to locate the buzzing component (transformer or relay). Then unplug again.
• Tighten mounting: Tighten screws holding the transformer or relay to reduce vibration.
• Check for heat: If the buzzing component is excessively hot, the power supply may be overloaded or failing; consider replacing the logic board.
• Monitor: Mild buzzing without overheating may be acceptable, but if noise worsens or is accompanied by malfunction, replace the logic board or opener.