GDO won't open, just the hum of the engiine
A 1/2 hp Craftsman GDO was pressed this morning after some use earlier in the morning, and now all it does is hum. The spring is not broken, visibly, and I can open up the door manually, once I pull the red safety cord.
The chain does not move when the button is pressed either. Ideas? Repair costs? If it's the motor, do I just get a new one? Installation costs?