Can't open garage door manually, why?
I have problems with my new garaqge door opener, am waiting for a new part to arrive, but that's a different story. I have been manually open the door for the last week or so without difficulties, but the last two days, I can't open it any more. I made sure that the door is disengaged from the opener's trolly, but when I lift to open it stop after listing only a few inches. I didn't want to force it too hard because I never have to do so before. Am I missing something? What should I look or do now? Thank you in advance.