Humming may be a good sign – you know it has power. The unit may
simply be bound up. Check the moving parts to ensure the rails aren’t
blocked and the armature is connected to the garage door. Ensure the
unit is engaged, not in manual mode.
Another possibility is, again, the force adjustment. Old, weak
springs may shift much of the burden for lifting and lowering the door
to the opener motor and drive system. While the unit may be able to
handle the weight, then again, it may not. The result will be a
straining motor that fails to open or close the door. Tweak the force
adjustment to solve this problem.
A handy way to determine if the fault lies in the opener or the door
is to eliminate the opener. Pull the emergency release handle hanging
from the overhead unit to disengage it and allow the door to open and
close manually. Lift and lower the door, testing the spring and rail
systems. Your door should stay at any point of travel, when released, on
its own. If it doesn’t and previous steps fail to fix the problem, the
springs are too worn and need replacement.
If, however, the door stays where it’s left and moves up and down
smoothly, the problem is likely an internal component in the garage door
opener unit itself. Keep the setting on manual, so you can continue to
use your garage, and consult a qualified professional.
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