My 1/2 HP GDO would go down about 2 feet in real cold weather and then reverse. Page 29 (Adjustment Step 2--Adjust the Force) of the Craftsman Owner's Manual says "Weather conditions can affect the door movement, so occational adjustment may be needed." There are two "screws" on the outside of the opener. Adjust one if you have up problems, adjust the other for down problems.
It worked for me. It only took a very slight turn to do the job for me.
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