Having a problem? (continued), Having a problem – Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT User Manual

Page 35

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Having a Problem?

(continued)

Situation

Probable Cause

&

Solution

The door opens but

won't dose:

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 thè down force.

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

Repeat the safety reverse test after the adjustment is compiete.

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

fuiiy dosedpo5\W on,

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:

Check the safety reversing sensor. Remove any obstruction or align the receiving eye.
See page 23.

The opener light:

.. -

doesn't turn on:

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

standard neck qaxB/Qe

door opener

bulb if regular bulb burns out.

,.,

doesn't turn off:

Is the Light feature

orP.

Turn it

off.

The opener strains or

maximum force is
neected 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 operatbn 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, reinstall the chain.

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

manuEdly. When the power is restored, press the Door Control push bar or 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.

Vie chain droops

or sags:

It is normal for the chain to droop slightly in the closed door position. Use the

emergency release to disconnect the trolley. If the chain returns to normal height when
the trolley is disengaged and the door reverses on a one-inch board, no adjustments

are needed (see page 11).

35

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