Why do my servos make a loud buzzing noise even when stationary?

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

Answer: Loud buzzing from servos at rest usually means they're receiving a constant signal telling them to hold position under load, causing the motor to strain. First, check your servo's neutral position in the controller or flight controller software—ensure the PWM signal centres the servo correctly. If the servo is slightly off-centre, it will try to correct constantly, causing buzzing. Next, verify the servo is not mechanically blocked or under excessive load; free movement reduces strain and noise. Also, confirm your power supply provides stable voltage within the servo’s rated range; low or noisy power can cause erratic behaviour. If you’re using a microcontroller or receiver, try recalibrating or adjusting endpoints to prevent the servo from trying to move beyond its limits. Finally, test the servo on a simple setup with no load to isolate the issue. Following these steps usually stops buzzing and extends servo life.