Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC

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We have a Liftmaster Professional Formula One garage door opener. The garage door will only open a few inches and stops. If we disconnect from the piece that runs on the track, that piece will move all the way along track in both directions...but not when connected to the door. We ran that piece all the way into open position and opened the door manually, replacing it on the piece on track...door then closes correctly but will only open those few inches again. Can you help??

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Did you check the spring tention or it could be a problem with the track

Posted on Sep 13, 2010

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