Chamberlain 1000SD, 2000SD stop, reverse, down, Simply wait 15 minutes and try again, stop, reverses

Adjustment Section: Pages 24 – 26

Adjustment Step 1

W

ARN ING

Adjust the UP and DOWN Limits

Improper adjustment of the travel limits will interfere with

Do not make any limit adjustments until the safety

the proper operation of the safety reverse system. The

reversing sensors are completely installed.

door might not reverse properly when required and could

seriously injure or kill someone under it. Test the safety

Limit adjustment settings regulate the points at which the

reverse system monthly, and following all adjustments to

the travel limits. See page 26.

door will

stop

when moving up or down.

The door will

stop in the up direction if anything

interferes with door travel. The door will

reverse

in the

down

direction if anything interferes with the door travel

(including binding or unbalanced doors).

To operate the opener, press the Door Control push bar or

button. Run the opener through a complete travel cycle.

1

2

+

3

• Does the door open and close completely?

7 5

3

7

5 3

8

1

8

1

• Does the door stay closed and not reverse

+

unintentionally when fully closed?

If your door passes both of these tests, no limit

Travel Limit

Adjustment

adjustments are necessary unless the reversing test fails

Right Side Panel

Screws

(see page 26).

Run the

Adjustment procedures are outlined below.

opener through a complete travel cycle after each

Adjust UP Travel

adjustment.

LIMIT ADJUSTMENT

+

Repeated operation of the opener during adjustment

LABEL

procedures may cause the motor to overheat and shut off.

Simply wait 15 minutes and try again.

+

Adjust DOWN Travel

Read the procedures carefully before proceeding to

Adjustment Step 2. Use a screwdriver to make limit

adjustments.

How and When to Adjust the Limits

If the door does not		open completely	but opens	at least
five feet:
Increase	up travel. Turn the UP limit adjustment screw
clockwise. One turn equals 2" of travel.
If door does not open at least 5 feet:			Adjust the UP
(open) force as explained in Adjustment Step 2.

If the door does not		close completely:
Increase	down	travel. Turn the DOWN limit adjustment

screw counterclockwise. One turn equals 2" of travel.

If door still won't close completely, try lengthening the door arm. (Page 22.)

If you have adjusted the door arm to the maximum length and the door still will not close completely, lower the header bracket. See Installation Step 1, pages 8/9.

If the opener		reverses	in fully closed position:
Decrease	down	travel. Turn the DOWN limit adjustment
screw clockwise. One turn equals 2" of travel.
If the door	reverses		when closing and there is no

visible interference to travel cycle:

If the opener lights are flashing, the Safety Reversing Sensors are either not installed, misaligned, or obstructed. See Troubleshooting, page 18.

Test the door for binding: Pull the manual release handle. Manually open and close the door. If the door is binding, call for garage door service. If the door is not binding or unbalanced, adjust the DOWN (close) force. See Adjustment Step 2.

24