Diagnostic Chart - Chamberlain Grifco CG3800 Instruction Manual

Unit
"Learn"
Button LED
or Diagnostic
LED
"Learn"
Button

Diagnostic Chart

1 FLASH
Safety reversing sensors
wire open (broken or
disconnected).
OR
2 FLASHES
Safety reversing sensors
wire shorted or black/white
wire reversed.
3 FLASHES
Door control or
wire shorted.
4 FLASHES
Safety reversing sensors
slightly misaligned
(dim or flashing LED).
5 FLASHES
Possible RPM sensor
failure. Unplug to reset.
9 FLASHES
Cable tension monitor
reversal.
Symptom: One or both of the Indicator lights on the safety reversing sensors
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 30-60mm (1-2") 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: LED is not lit on 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.
Symptom: Sending indicator light glows steadily, receiving indicator light is
dim or flashing.
• Realign receiving eye sensor, clean lens and secure brackets.
• Verify door track is firmly secured to wall and does not move.
Symptom: The RPM Sensor = Short travel 150-200mm (6-8").
• Unplug unit to reset. Try to operate motor unit, check diagnostic code.
• If it is still flashing 5 times and motor unit moves 150-200mm (6-8"),The unitʼs APE
(Absolute Positioning Encoder) may need to be replaced, for details contact your
Chamberlain reseller.
Symptom: Door reverses while closing.
• Check for possible door obstructions and remove.
• Check that the cable tension monitor is properly connected to the operator.
• Replace the cable tension monitor.
Installed
Safety Reversing
Sensor
Your door operator is programmed with self-diagnostic
capabilities. The "Learn" button/diagnostic LED will flash a
number of times then pause signifying it has found a
potential issue. Consult Diagnostic Chart below.
19