Craftsman 139.53403 Owner's Manual page 21

Having a Problem? (Continued)
SITUATION
DOOR WON'T CLOSE
PROBABLE CAUSE & SOLUTION
i ,i I i,ii .... iiI
1 The infrared Reversing Sensor (if you have instaIJed this accessory} may
be misaligned or obstructed. Disconnect sensor and check door opera-
tion If problem disappears, correct alignment
DOOR REVERSES FOR
NO APPARENT REASON
1 Is something obstructing the door? Pull red emergency release handle
Operate door manually If it is unbalanced or binding, call a garage door
serviceman to correct the problem
2 Clear any ice or snow from garage floor area where garage door closes.
3 Review the Force Adjustment Chart on Page 17 Repeat Safety Reverse
Test after adjustment is complete
4. If door reverses in FULLY CLOSED position, decrease travel limits (See
Pg 17) and repeat Safety Reverse Test after adjustment is complete.
THE NEED FOR OCCASIONAL ADJUSTMENT OF FORCE AND LIMIT SET-
TINGS IS NORMAL. WEATHER CONDITIONS IN PARTICULAR CAN AFFECT
DOOR TRAVEL
5_ The Infrared Reversing Sensor(if you have installed this accessory) may
be misaligned or obstructed. Disconnect sensor and check door opera-
tion. If problem disappears, correct alignment
OPENER LIGHT
DOESN'T TURN ON
1 Replace the light bulb (75Watts Maximum) Use rough service bulbs if
standard bulbs burn out prematurely due to vibration (Vibration may be
caused by loose end panels_ Retighten screws)
DOESN'T TURN OFF
1 There may be a defective ground at ceiling or wall receptacle Unit must
be grounded.
OPENER STRAINS OR
MAXIMUM FORCE IS NEEDED
TO OPERATE DOOR
Door may be out of balance Use emergency release rope and handle to
disconnect trolley Open and close door manually.
A properly balanced door will remain in any point of travel while being sup-
ported e ntirely by its springs If it does not, call a garage door serviceman to
correct problem
OPENER MOTOR HUMS
BRIEFLY, THEN WON'T RUN
2
Trolley may be ja mined into rail stop bo_ts Pull or push on door while motor
is hu taming to release jammed condition Re-adjust door limits (Page 17)
to prevent over-traveL
if problem occurs on the first operation during the installation process or
after the chain was removed and re-installed, the motor may be out of
phase Remove chain; cycle motor to down position (Observe the drive
sprocket When it turns in clockwise direction and stops, motor is in down
position) Re-install chain_
OPENER WON'T OPERATE
DUE TO POWER FAILURE
1 Use emergency release rope and handle to disconnect trolley Door can
be opened and closed manually When the power is restored, press the
wall push button and trolley wilt automatically reconnect
2 The emergency release key lock accessory (for use on garages with no
service door) disconnects the trolley from outside the garage in case of
power failure
CHAIN DROOPS OR SAGS
It is normal for the chain to droop slightly in closed door position Use
emergency release rope and handle to disconnect trolley If chain returns
to normal height when trolley is disengaged and door re_verses on a one-
inch obstruction, no adjustments are needed See Page 9
21