Why do my servos buzz loudly even when they’re not moving?

Question: Why do my servos buzz loudly even when not moving?

Answer: Loud buzzing from servos at rest usually means they are trying to hold a position under load or receiving a constant signal that causes them to strain. First, check your servo’s neutral signal input; if it’s not centred correctly, the servo will fight to reach a position, causing buzzing. Use a servo tester or your transmitter to ensure the signal is at the midpoint. Second, inspect if the servo horn or linkage is physically obstructed or under mechanical stress—free up any tight spots. Third, verify your power supply voltage and current; insufficient power can cause servos to buzz as they struggle. Finally, consider the servo’s quality and age since worn gears or motors can buzz when failing. To reduce buzzing, ensure the servo position matches the mechanical setup, provide a stable power source, and avoid continuous holding torque unless necessary. If buzzing persists, try swapping the servo to isolate the issue.