Master Lock ATS 211 - Manual (Page 27)

Having a Problem?
(continued)
Situation Probable Cause & Solution
The door reverses for
no apparent reason
and opener light
doesn't blink: 1. Is something obstructing the door? Pull the red manual release handle. Operate the
door manually. If it is unbalanced or binding, call a garage door serviceman to
correct the problem.
2. Clear any ice or snow from the garage floor area where the door closes.
3. Review force adjustment procedures on page 22.
Repeat the safety reverse test after the adjustment is complete.
4. If door reverses in the fully closed position, decrease the travel limits (page 21).
Repeat safety reverse test after the adjustment is complete. The need for
occasional adjustment of the force and limit settings is normal. Weather
conditions in particular can affect door travel.
. . . doesn't turn on:
1. Replace the light bulb (75 watts maximum). Use a "garage door opener bulb" if
standard bulb burns out prematurely due to vibration. Vibration may be caused by
loose end panel. Retighten the screws.
. . . doesn't turn off:
1. There may be a defective ground at the ceiling or wall receptacle. The unit must be
grounded.
The opener strains or
maximum force is
needed to operate
door: 1. The door may be out of balance or the springs are broken. Close the door and use
the manual release rope and handle to disconnect the trolley. Open and close the
door manually. A properly balanced door will stay in any point of travel while being
supported entirely by its springs. If it does not, disconnect the opener and call a
garage door serviceman to correct the problem.
Do not increase the force to
operate the opener.
The opener motor
hums briefly, then
won't work: 1. The garage door springs are broken. See above.
2. The trolley may be jammed into the stop bolts. Pull or push on the door while the
motor is humming to release the jammed condition. Re-adjust the door limits (page
21) to prevent over-travel.
Repeat the safety reverse test after the adjustment is complete.
3. If the problem occurs on the first operation of the opener, door may be locked.
Disable the door lock. If the chain was removed and reinstalled, the motor may be
out of phase. Remove the chain; cycle the motor to the down position. Observe the
drive sprocket. When it turns in a clockwise direction and stops in the down position,
re-install the chain.
Repeat the safety reverse test after the adjustment is complete.
The opener won't
operate due to
power failure: 1. Use the manual release rope and handle to disconnect the trolley. The door can be
opened and closed manually. When the power is restored, press the Door Control
push button and trolley will automatically reconnect (unless trolley is in lockout
position. See page 25.)
2. The Outside Quick Release accessory (for use on garages with no service door)
disconnects the trolley from outside the garage in case of power failure.
The chain droops
or sags: 1. It is normal for the chain to droop slightly in the closed door position. Use the manual
release rope and handle to disconnect the trolley. If the chain returns to the normal
height when the trolley is disengaged and the door reverses on a 2x4, no
adjustments are needed (see page 7).
27
The opener light
The door opens but
won't close: 1. Check the safety reversing sensor. If the sensor lights do not glow, see page 18.
1. Check the safety reversing sensor. Remove the obstruction or align the receiving
eye. See page 18.
The door reverses for
no apparent reason
and opener light
blinks for 5 seconds
after reversing: