Sears GDO Partially Closes/Goes Back Up
Part no. 41A5021-2F, about 6 yrs old closes within a foot of bottom then reverses to full open with light flashing.
No obstruction on sensors. On outside of opener housing there are two adjustment screws: ones shows KG with up arrow, other KG with down arrow and shows that a CW adjustment increases force. I assume this adjusts the up and down force but not travel?
Sensor or adj problem or other cause? Have lost the manual that came with the opener.