Craftsman 139.53678SRT Owner's Manual page 35

Situation
The door opens but
won_ close:
Having a Problem? (continued)
Probable Cause & Solution
.
2.
If the opener lights blink, check the safety reversing sensor. Sea page 23.
If the opener lights do not blink and it is a new instal|atlon, 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.
The door reversesfor
no apparentmason
and opener I_ghts
donYblink:
.
,
3.
4.
Is something obstructing the door?. Pull the red emergency release handle. Operate
the door manually. If it is unbalanced or binding, cell for professional garage door
service.
Clear any ice or snow from the garage floor area where the door closes.
Review the force adjustment procedures on page 29.
If door reverses in the fully closed position, decrease the travel limits (page 28).
Repeat safely rever3e test after adjustments to force or travel limits, The need
for occasional adjustment of the force end limit settings is normal. Weather
conditions in particular can affect door travel.
The door reverses for
no apparent reason
andop_er 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 lights:
The openerslralns or
maximum force is
.eeded to opere_
door:.
•.. don_t turn on:
Replace the light bulbs (75 watts maximum). Use a standard neck garage door opener
bulb if regular bulb bums out.
•.. don _tturn off:.
Is the Light feature on? Turn'it off.
The door may be out of balance or the springsara Ixoken. Close the door and use the
emergency release to disconnectthe trolley.Open and close the door manually. A properly
balanced door will stay in any point of travel whiie being supperted antiraiy by itssprings, ff it
does not, disconnectthe opener and call a professionalgarage door servicemen. Do not
increa_ the forca to operMe the opener.
The opener motor
hums briefly, then
won't work:
ii
The opener won_
operats due to
power failure:
1. The garage door springs are broken. Sea above.
2. If the problem occurs on the first operal_onof the opener, door may be locked. D/sab/e
the door/ock. 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 dires_on and stops in the down position, reinstallthe chain.
Repeat the safety reverse teat after the adjuslment Is compiets.
1. Usa the emecgencyralease to disoonnect the Voney.The door cen be spened and closed
manualy.Whenthepewerisrestored, presstheDoorControlpushbutlonandtrofleywUl
automa_ally reconnect(unlsssVolleyis in lockoutposll_.) Sea page 32.
2. The Emergency Key Release accessory (for use on garages with no service door)
disconnects the troliey from outside the garage in case of power failure.
The chain droops
or sags:
It is normal for the chain to droop slightly in the closed door poait]on. Use the
emergency rak_Paeto 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
ere needed (see page 11).
35