Chamberlain 459950 User Manual
36
Diagnostic Chart
Your garage door opener is programmed with self-diagnostic
capabilities. The “Learn” button/diagnostic LED will fl ash a
number of times then pause signifying it has found a potential
issue. Consult Diagnostic Chart below.
capabilities. The “Learn” button/diagnostic LED will fl ash a
number of times then pause signifying it has found a potential
issue. Consult Diagnostic Chart below.
“Learn”
Button
LED or
Diagnostic
LED
Button
LED or
Diagnostic
LED
“Learn”
Button
Button
Diagnostics
Located On
Motor Unit
Located On
Motor Unit
Installed
Safety Reversing
Sensor
Bell Wire
Safety Reversing Sensor
Symptom: One or both of the Indicator lights on the safety reversing sensors
do not glow steady.
do not glow steady.
• Inspect sensor wires for a short (staple in wire), correct wiring polarity (black/
white wires reversed), broken or disconnected wires, replace/attach as needed.
• Disconnect all wires from back of motor unit.
• Remove sensors from brackets and shorten sensor wires to 1-2 ft (30-60 cm)
from back each of sensor.
• Reattach sending eye to motor unit using shortened wires. If sending eye
indicator light glows steadily, attach the receiving eye.
• Align sensors, if the indicator lights glow replace the wires for the sensors. If
the sensor indicator lights do not light, replace the safety reversing sensors.
Symptom: The door doesn’t activate from the door control.
• Inspect door control/wires for a short (staple in wire), replace as needed.
• Disconnect wires at door control, touch wires together. If motor unit activates,
replace door control.
• If motor unit does not activate, disconnect door control wires from motor unit.
Momentarily short across red and white terminals with jumper wire. If motor
unit activates, replace door control wires.
unit activates, replace door control wires.
Symptom: Sending indicator light glows steadily, receiving indicator light is
dim or fl ashing.
dim or fl ashing.
• Realign receiving eye sensor, clean lens and secure brackets.
Symptom: Door travels 2-3 inches and stops.
• Reprogram limits and forces. See Adjustment section.
• If the motor unit continues to travel 2-3 inches, check the travel module
connection or replace the travel module.
Symptom: No movement, motor runs 2-3 seconds.
• Reconnect the emergency release.
• Motor may need to be replaced.
Motor RPM is not
recognized.
recognized.
Safety reversing sensors
slightly misaligned
(dim or fl ashing LED).
slightly misaligned
(dim or fl ashing LED).
Safety reversing sensors
wire shorted or black/white
wire reversed.
wire shorted or black/white
wire reversed.
Safety reversing sensors
wire open (broken or
disconnected).
wire open (broken or
disconnected).
OR
5 FLASHES
4 FLASHES
3 FLASHES
2 FLASHES
1 FLASH
Door control or wire
shorted.
shorted.