Craftsman 139.18987 Owner's Manual download pdf (Page 35)

Having a Problem?

(continued)

Situation Probable Cause & Solution

The door reverses for

no apparent reason

and opener lights

don't blink:

1. Is something obstructing the door? Pull the red emergency release handle. Operate

the door manually. If it is unbalanced or binding, call for professional garage door

service.

2. Clear any ice or snow from the garage floor area where the door closes.

3. Review the force adjustment procedures on page 29.

4. If door reverses in the

fully closed

position, decrease the travel limits (page 28).

Repeat safety reverse test after adjustments to force or travel limits. The need

for occasional adjustment of the force and limit settings is normal. Weather

conditions in particular can affect door travel.

The door reverses for

no apparent reason

and opener lights

blink for 5 seconds

after reversing:

The opener lights:

. . . don't turn on:

Replace the light bulbs (75 watts maximum). Use a

standard neck

garage door opener

bulb if regular bulb burns out.

. . . don't turn off:

Is the Light feature

? Turn it

off.

The opener strains or

maximum force is

needed to operate

door:

The door may be out of balance or the springs are broken. Close the door and use the

emergency release 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 professional garage door serviceman.

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. If the problem occurs on the first operation of the opener, door may be locked.

Disable

the door lock

. If the belt was removed and reinstalled, the motor may be out of phase.

Remove the belt; cycle the motor to the down position. Observe the drive sprocket.

When it turns in a clockwise direction and stops in the down position, reinstall the belt.

Repeat the safety reverse test after the adjustment is complete.

The opener won't

operate due to

power failure:

1. Use the emergency release 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 32.

2. The Emergency Key Release accessory (for use on garages with no service door)

disconnects the trolley from outside the garage in case of power failure.

The door opens but

won't close:

Check the safety reversing sensor. Remove any obstruction or align the receiving eye.

See page 23.

1. If the opener lights blink, check the safety reversing sensor. See page 23.

2. If the opener lights do not blink and it is a new installation, check the down force.

See Adjustment Step 2, page 29. For an existing installation, see below.

Repeat the safety reverse test after the adjustment is complete.

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Craftsman 139.18987 Owner's Manual Page 35

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