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

Safety first: Disconnect power before tightening internal components. Do not touch live parts.

Steps to reduce humming:

• 1. Verify normal operation: Ensure the opener functions correctly; a mild hum from the transformer can be normal.
• 2. Tighten mounting screws: Inside the opener, gently tighten screws holding the transformer and logic board to reduce vibration.
• 3. Add isolation: Use rubber washers or pads between the opener mounting straps and ceiling to reduce transmitted noise.
• 4. Replace transformer or opener: If the hum is loud and accompanied by heat or odor, the transformer may be failing and the board or opener should be replaced.