Chamberlain GS400D Owner's Manual page 33

Use the GATE 1 buttons to move gate to the desired OPEN position. When gate is in the desired position, press the
LEARN LIMITS button again. Control board will make a 'beep' sound.
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Use the GATE 1 buttons to move gate to the desired CLOSED position. When gate is in the desired closed position,
press the LEARN LIMITS button again. The open and close limits have been programmed. Control board beeps and the
SET OPEN and CLOSE LEDs stop blinking.
DIAGNOSTIC
After learning limits, use the SBC to open and close the gate to verify the limits and baseline the force needed to move
the gate.
NOTE: If the SET OPEN LIMIT LED is still blinking, limits were not learned successfully. Repeat the procedure making
sure the gate is fully opened and closed for each respective limit. If the problem persists, refer to the Troubleshooting
section.
OPEN EDGE/
DIAGNOSTIC
GATE 1
SET
CLOSE
GATE 1
SET
CLOSE
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DIAGNOSTIC
GATE 1
SET SET
LEARN
OPEN CLOSE
LIMITS
LIMIT LIMIT
GATE 2
FORCE
Programming