Troubleshooting - Chamberlain 8550 Manual

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.
DIAGNOSTIC UP DOWN
CODE ARROW ARROW
1-1 1 FLASH 1 FLASH
1-2 1 FLASH 2 FLASHES
1-3 1 FLASH 3 FLASHES
1-4 1 FLASH 4 FLASHES
1-5 1 FLASH 5 FLASHES
SYMPTOM
The garage door opener will not close
and the light(s) will flash
The garage door opener will not close
and the light(s) will flash
Wall-mounted door control will not
function
The garage door opener will not close
the door and the light(s) flash
The garage door opener clicks but no
movement
The opener runs approximately 6-8"
and stops and/or reverses
CAUSE RESOLUTION
Safety sensors are not
Inspect sensor wires for a disconnected or cut wire(s). If the sending sensor with the
installed, connected, or
amber LED is NOT lit, check the wire and connections for that sensor. If sending
wires may be cut
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.
Safety sensor wire
Inspect sensor wire for incorrect wiring or a pinched wire. If the sending sensor
shorted or reversed
(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.
The wires for the door Inspect door control wires for a short (staple in wire), replace wire (22 gauge wire) as
control are shorted or needed. After installing new door control wires, if door control still does not operate
the door control is faulty garage door opener, replace the door control.
Misaligned or
Realign the receiving sensor (green LED) by ensuring the LED is steady and not
obstructed safety
flickering. A flicker of the safety sensor LED indicates a misalignment. Make sure
sensors
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.
Bad logic board
Replace the logic board.
Communication error to Disconnect all power, remove cover, and locate the travel module. Ensure the wires
travel module for travel module are connected, if wires are connected, then replace the travel
module.
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