Craftsman 139.53675SRT - Manual (Page 35)

Having a Problem? (continued)
Situation Probable Cause & Solution
The door opens but
woni dose: 1. if the opener lights blink, check the safety reversing sensor. See page 23.
2. If the opener lights do not biink 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 añer the adjustment is complete.
The door reverses for
no ^parent r^son
srtd opener liphts
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, cal! 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 c/osedposition, 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 S seconds
C i » X i e S r 1 W fcr J ¿yf t ■
Check the safety reversing sensor. Remove any obstruction or align the receiving eye.
See page 23.
The opener lights:
.., don’t turn on;
Replace the fight bulbs (75 watts maximum). Use a standard neck garage door opener
buib if regular bulb bums out.
... don’t turn off:
is tie Light feature on? Turn it off.
The opener strains or
maximum forcé 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 dose the door manually, A properly
balanced door will stay in any point of travel while being supported enflrely by Ks springs, if it
does not, disconnect tie 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 chain was removed and reinstalled, the motor may be out of phase.
Remove the chan; cycle the motor to the down position, Observe the drive sprocket
When !t tjms In a clockwise direcfion 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. TTie door can be opened and dosed
manually. When the power is restored, press the Door Control push button and trolley will
automatically reconnect (unless trolley is in tockoirt 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 chain droops
K J I otitJfiv#
It is norma! for the chain to droop slightly in the dosed door position. Use the
emergency release to disconnect the troiley. 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).
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