One of our Craftsman garage door opener has recently started not always opening the whole way. It will come up to about five feet and stop. If we put it down and reverse it a few times, eventually it will go all the way up. This doesn't happen with every open, but it's frequent enough to be frustrating - probably 20% of lifts.
I adjusted the up force control to increase force, and that seemed to help but hasn't eliminated the problem. While I was up there, though, I noticed two things:
- The belt for this opener seems to be significantly looser than the one on the other door bay. However, before a lift which fails, one side of the belt will be quite taut and the other slack.
- The LED by the "learn" button is blinking: six blinks, then a pause (during which it flickers a bit), then six blinks, etc.. The manual says this probably indicates a logic board failure, because the status is meant to indicate a motor failure, and the logic board fails more often than the motor.
I'm relatively handy but I'm inexperienced with garage door openers. I'm relatively confident replacing the logic board (based on instructions I've read) but much less so troubleshooting the belt; I don't know where to start there. On the other hand, if the issue is the belt, replacing the logic board is unlikely to solve the problem (even if it's actually necessary).
How can I figure out if the problem is the belt or the logic board (or both)? (Subtext: should I keep at it myself or call a professional?)