Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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Fixing a craftsman half horsepower garage door opener

I got two crafstman half horsepower door openers that are within 3 years old each. just today the second one began suffering from the same problem that the first has succumbed to. I understand how to install the units in terms of proper up and down travel lengths and down and up force, but now with the down force at maximum both door openers refuse to close and send the door back up and blink the light as if the track is seized. i release the trolley and the travel seems to be fine they operate up and down by hand as much as i want.

I don't really know anything about maintenance or proper settings of the existing counterbalance parts since i didn't install those and they have existed since the time of the garage being built in the 70's. The springs are fine though and not broken. Could it be that half horsepower just isn't enough torque and it keeps tripping on overload now that they have worn in?

should i have gotten three quarter horsepower openers?

i'm stumped.

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If the main light on the motor unit flashes 10 times and the door reverses to the open position it is a door sensor problem. Check to make sure they are pointed at one another. Each of them has a small light that should be lit and not flickering when they are aligned correctly.

Posted on Jul 23, 2009

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What does the purple button light flashing on 1/2 horsepower craftsman garage door opener


I think the adjustment mode is on.

For example, that's from Craftsman manual:

""
Setting the Force
The force setting button is located on the left panel of the motor unit. The force setting measures the amount of force required to open and close the door.
1. Locate the purple button on the left panel of the motor unit (Figure 1).
2. Push the purple button twice to enter the opener into Force Adjustment Mode (Figure 2). The LED (Indicator Light) will flash quickly.
3. Push the remote control or control console (Figure 3). The door will travel to the DOWN (close) position.

""

Actually, you should just read carefully your garage door opener unit's manual.

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