Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT - Manual (Page 34)

Having a Problem?
Situation Probable Cause and Solution
The opener doesn t
operate from either
the Door Controlar
the remote control:
1. Does the opener have electric power? Plug a lamp into the outlet. If it doesn’t light,
check the fuse box or the circuit breaker. (Some outlets are controlled by a wall switch.)
2. Have you disabled all door locks? Review installation ihstruction warnings on Page 11.
3. Is there a build-up of ice or snow under the door? The door may be frozen to the
ground. Remove any restriction.
4. The garage door spring may be broken. Have it replaced.
5. Repeated operation may have tripped the overload protector in the motor. Wait
15 minutes. Try again.
Opener operates
from the remote
control, but not from
the Door Control:
1. Is the Door Control lit? If not, remove the bell wire from the opener terminal screws.
Short the red and white terminals by touching both terminals at the same time with a
piece of wire. If the opener runs, check for a faulty wire connection at the Door
Control, a short under the staples, or a broken wire.
2. Are the wiring connections correct? Review Step 6, page 18.
The door operates
from the Door
Control, but not from
the remote control:
1. Is any door push button flashing? If your model has the Lock feature, make sure the
lock is Off.
2. Your opener needs to re-learn a remote control code. Refer to Instructions on the
opener panel.
3. Program the receiver to match the remote control code.
4. Repeat the receiver programming procedure with all remote controls.
The remote control
has short range:
1. Change the location of the remote control in your car.
2. Check to be sure the antenna on the side or back panel of opener extends fully
downward.
3. Some installations may have shorter range due to a metal door, foil backed
insulation, or metal garage siding. (Antenna Extender Kit 41A3504)
Opener noise is
disturbing in living
quarters of home: If operational noise is a problem because of proximity of the opener to the living
quarters, the Vibration Isolator Kit 41A3263 can be installed. This kit was designed to
minimize vibration to the house and is easy to install.
The garage door
opens and doses
by itself:
1. Be sure that all remote control push buttons are off.
2. Remove the bell wire from the Door Control terminals and operate from the remote
control only. If this solves the problem, the Door Control is faulty (replace), or there Is
an intermittent short on the wire between the Door Control and the opener.
3. Clear memory and reprogram all remote controls.
The door doesn't
open completely:
1. Is something obstructing the door? Remove the obstruction or repair the door.
2. If the door has been working properly but now doesn't open all the way, increase the
up force. See page 29.
3. If door opens at least 5 feet, the travel limits may need to be increased. One turn
equals 2 inches of travel. See page 28.
Repeat the safety reverse test after the adjustment is complete.
The door stops but
doesn’t dose
completely:
Review the travel limits adjustment procedures on page 28.
Repeat the safety reverse test after any adjustment of door arm length, dose
force or down limit
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