I changed the batteries on my Foy's opener as a precaution. Sometime the same day the string broke causing the door to shut and stranding my chickens overnight in the blowing snow (but in a predator proof run). I've tried to replace the string but no matter what I've tried, I can't get the motor to turn in the direction to close the door. I had been using the photocell exclusively, but I also have the timer. I have the string wound up in the open position, with a knot in the string at the place where it enters the opener when the door is in the up position. It won't go back down! Is there anyone out there who has any suggestion of what I might try? I've been working on it all afternoon and am about to pull out my hair. Foy's won't help because I am not the original purchaser and the unit is out of warranty. I suspect it might have something to do with which pins I have the connectors attached.