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’re receiving a constant signal telling them to hold a position under load. This causes the motor to strain, generating noise. First, check your servo’s control signal: ensure the pulse width matches the neutral position (usually around 1.5ms). If the signal is slightly off, the servo will try to adjust continuously, causing buzzing. Second, if the servo is mechanically restricted or overloaded, it will buzz trying to maintain position. Make sure the servo horn isn’t jammed or under excessive force. Third, if you’re using an electronic speed controller or flight controller, verify the output settings and calibration. To fix buzzing: 1) centre the servo signal using your transmitter or controller; 2) remove any mechanical load or obstruction; 3) test with another servo to rule out hardware faults; 4) if buzzing persists, try reducing the holding torque by sending a relaxed signal or powering down when not actively controlling. This should reduce noise and extend servo life.