Old opener parts mismatch
Where it goes sideways is when a homeowner (or a handyman) treats a 2008-era opener like a newer unit. The logic boards and safety sensor wiring from that period aren't always a drop-in match for parts sold today, so a mismatched sensor or a universal remote that 'should' pair sometimes doesn't, and you end up with a door that opens but won't close on its own.\n\nThe other place it goes wrong is spring replacement done with the wrong wire gauge.
