The door lock actuator probably failed because it was powered too long. It consists of a simple motor that moves in one direction to move the control arm. When it reaches the far end, in a fraction of a second, the motor simply stalls and keeps pulling current until the voltage is turned off. If it pulls current for too long, it will heat up enough to break the small motor winding wire. Ask John all about it. He was the first person in the hobby to fry one ☺ When using a manual fire button, the button stays pressed for a lot longer than is required. So, you should always just tap the button, not press and hold. After the battle, I'll build a circuit for you that activates the actuator for 100 milliseconds, regardless of how long the button is pressed. We've been using that approach with door lock actuators ever since John blazed the trail and we haven't lost one since.
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