Troubleshooting; Diagnostic Chart - LiftMaster 8550C Mode D'emploi

Troubleshooting

Diagnostic Chart

Your garage door opener is programmed with self-diagnostic capabilities. The UP and DOWN arrows on the garage door opener flash the diagnostic codes.
UP DOWN
DIAGNOSTIC
ARROW ARROW
CODE
FLASH(ES) FLASH(ES)
1-1 1 1
1-2 1 2
1-3 1 3
1-4 1 4
1-5 1 5
SYMPTOM CAUSE
The garage door opener Safety sensors are
will not close and the not installed,
light(s) will flash connected, or wires
may be cut
The garage door opener Safety sensor wire
will not close and the shorted or reversed
light(s) will flash
The wires for the
Wall-mounted door
control will not function
door control are
shorted or the door
control is faulty
The garage door opener Misaligned or
will not close the door obstructed safety
and the light(s) flash sensors
The garage door opener Bad logic board
clicks but no movement
The opener runs Communication
approximately 6-8" and error to travel
stops and/or reverses module
RESOLUTION
Inspect sensor wires for a disconnected or cut wire(s). If the sending sensor with the amber LED is NOT lit,
check the wire and connections for that sensor. If sending sensor LED is lit, check the wire connections
leading to the receiving sensor (green LED). Reattach wire or replace wire (22 gauge wire) as needed. If
pre-wired home, check the splices. See page 18 for installation. Close the garage door using the remote
control or the door control.
Inspect sensor wire for incorrect wiring or a pinched wire. If the sending sensor (amber LED) is not lit, check
the wire leading to and from that sensor. Check staple points. If sending sensor LED is lit, check the wire
leading to the receiving sensor (green LED). Reattach wire or replace wire (22 gauge wire) as needed. If
pre-wired home, check the splices. See page 18 for installation. Close the garage door using the remote
control or the door control.
Inspect door control wires for a short (staple in wire), replace wire (22 gauge wire) as needed. After
installing new door control wires, if door control still does not operate garage door opener, replace the door
control.
Realign the receiving sensor (green LED) by ensuring the LED is steady and not flickering. A flicker of the
safety sensor LED indicates a misalignment. Make sure nothing is hanging or mounted on the door
interrupting the sensor's path while closing. Close the garage door using the remote control or the door
control.
Replace the logic board.
Disconnect all power, remove cover, and locate the travel module. Ensure the wires for travel module are
connected, if wires are connected, then replace the travel module.
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