When I press the opener button, the opener begins to open the door but stops at the first door section, only opening the door 1/4 of the way. If I have someone press the button and I apply upwards pressure on the door, it will open with my assistance all the way. If I stop applying the pressure, the door will stop at that point. This is a belt drive unit, board number 41A5021-5E, and this difficulty started just yesterday. The opener was installed in 05/00 and we have never had an issue with it before. There is no visible damage to the tracks, sensors, etc. and we have experienced no known accidents involving any of these. It just won’t lift the door. I am a "do-it-yourselfer" and am seeking guidance from an expert to tell me where to start and a potential diagnosis for the problem. I did momentarily disconnect power in an attempt to "reset" the unit. I also used the quick release and the unit will operate as usual withhout the door attached. THANK YOU!
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Garage Door Opener Clicker