My garage door opener suddenly stops working after about 5 years. The opener is a Lift-Master 1/3 HP with chain. After press the remote button to open/close the garage door, I can hear the (moter ??) sound, but the chain doesn't move. Does anyone have an idea which part is broken? What do I possibly need to fix it?
Also, the previous owner did not have a manual when I bought the house. Where can I download/buy a manual?
Thanks Scott