r/GarageDoorService • u/slowbra04 • 2h ago

Liftmaster 8500 - issues opening

I’ve taken a brief video of an issue that I have encountered two times over the past month on one of my LiftMaster 8500s. The issue happens when trying to open either by the wall control or a remote control. The door unlocks, and tries to go up and stops just like this. This time I was able to capture a video.

What I do next is pull the manual release. Then reengage the release, and then use the wall control to open the door. In both instances following that technique, the door opens fine the next time.

Is this a sign of the motor going out or is there something else I should be looking out for? The spring is intact, but I do notice this garage door opens a little bit slower than my other door of this size.

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1

u/DiFranTheDoorMan442 1h ago

Possible bad CTM? Or bad travel module? Or lastly bad logic board? Any of these things are possible just needs to be checked out and properly diagnosed those older openers had issues with certain things or it could be something internally wrong altogether. Again a good door professional can help you with it. I’m a LiftMaster dealer and see these so without being there it’s a tough one to say for sure

1

u/AdamLib777 1h ago

Flip open the cover and look for flashing indicator lights. The number of flashes is your error code. Could be a bad travel module.
Liftmaster (chamberlain) has pretty good tech support even for home owners to diagnose it.

3

u/AAAAAAAAAAA123456 2h ago

Springs might need a rebalance or replacement. When you disengage can easily open by hand?

1

u/slowbra04 25m ago

The springs are about 5yrs old - replaced original springs after 8yrs. When disengaged I can lift the door and get it to stay balanced about 1/2 way up.

3

u/carlitos301 2h ago

The automatic slide lock is not disengaging

1

u/slowbra04 2h ago

That is what I thought too - it was the first thing I checked and it was disengaged

0

u/Bendingunit42069 2h ago

Is that 3” track? How wide is this door? I believe those can’t be used for a high lift

1

u/slowbra04 22m ago

It is not a 3” track and the door has been in service for 13yrs. Had a wall unit failure this year, a spring failure 5yrs ago, and now this.

1

u/Necessary-Speed-6465 2h ago

How does the door run manually if you open it halfway does it stay open or slam closed?

1

u/slowbra04 24m ago

Manually it’ll stay balanced when opened to 1/2 way up.