Release opener from door, by pulling down on the red rope. See if you can manually raise and lower door. If not you need to determine where the problem is. If the door is heavy when lifting call a garage door company. The torsion springs are very dangerous
SOURCE: Liftmaster Garage Door Opener Problems...
The problem lies in the RPM sensor, most likely due to the interrupter cup assembly. The interrupter cup assembly is the black cap that runs through the RPM sensor. You may have forgotten to re-attach this piece or it is probably moving too far out when the garage sets in motion. To fix this, remove the cup assembly, unscrew the two screws on the top metal piece with a 1/8 allen wrench, push the metal piece as far in as possible and put the screws back on. This will give more room for the cup assembly to spin and be read by the RPM sensor. Hope this helps!
SOURCE: Chamberlain Liftmaster Professional 1/2 HP
Okay...upon further inspection, my left spring has broken in two. Going to call around for some quotes to replace the spring. Thanks for the suggestions.
SOURCE: My garage door won't close unless I hold the main button down
your garage door has saftey sensors at the door
these are photo eyes
in the owners manuel that came with the opener
that has pictures in it which would help
the photo eyes need to be clear of debri and aimed at each other with no obstruction
there are leds on each sensor and when aimes properly they should be light if i remember correctly
if you can not get them to light then you may have to replace the sensors
SOURCE: My Sears Craftman garage door opener closes about
If the main light is flashing 10 times when the door reverses it is a door sensor problem. One may have been bumped so that they no longer point at one another. Make sure the small light on each sensor is lit and not flickering. If this isn't the case you might need to increase the down force a little. The control is on the back panel near where all those white wires go. Increase it about 1/4 turn and try.
SOURCE: Access Master 1/3 HP garage door does not close, blinks
Most likely your door sensors are out of alignment. Make sure they are pointed directly at one another.
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