content: I bought the GT-100A door closer along with the open/close status monitor in December of 2009. I installed it myself and everything was great until January 2011 when the door stopped closing automatically. It seems the timer has failed a month after the warranty ran out. Poor quality product in my opinion. The documentation is not very clear on how to troubleshoot this issue so I unplugged power to the garage door closer and started from scratch to confirm that the unit has experienced a failure.