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19  Garage Door Operator Maintenance

Weather conditions may affect the door operation which could require some re-setting of the operator’s adjustments. 

Doors may swell and become heavier during wet periods, door hinges and rollers might bind during cold periods. 

To insure safe operation of the door, perform the following tests, including any additional test steps described.

Every Month

1

 

With the door closed, pull the red release handle to 

disconnect the operator from the door.

2 From outside the garage, slowly open the door 

manually all the way, and then close it all the way. 

Notice if there is any binding, sticking or rubbing. The 

door should move smoothly in both directions.

3  Raise the garage door about halfway up. Carefully 

release the door and see if the door balances. It 

should stay in place. Close the door.

  

NOTE:

 If the garage door is unbalanced or the door 

travel isn’t smooth, have a qualified garage door 

professional adjust or repair the door.

4

 

To reconnect the operator, flip the release lever up 

and run the operator.

5  Perform the Safety Beam Test (Section 12).
6

 

Perform the Safety Reversal System Test as 

described in Section 16.

After Servicing the Operator

1

 

Perform the Safety Beam Test (Section 12).

2

 

Perform the Open and Close Limit Adjustments 

(Section 14).

3  Perform the Safety Reversal System Test (Section 16).

Every 6 Months

Check the belt or chain tension.

• 

For belt-drive rails, examine the length of the tension 

spring in the traveler. It should be about 1” long.

•  For chain-drive rails, examine the spacing between 

the turnbuckle and the rail. The turnbuckle should be 

slightly above the rail.

  

NOTE:

 Too much or too little chain tension will cause 

excessive sprocket noise.

Chain Adjustment

If necessary, use the following steps to adjust the chain.

1

 

Hold the turnbuckle with a flat blade screwdriver and 

loosen the two locknuts with a 7/16” end wrench.

2 Twist the turnbuckle to adjust the chain tension. 

Adjust the chain until the turnbuckle is sightly above 

the rail.

3  Hold the turnbuckle with a flat blade screwdriver and 

tighten the two locknuts with a 7/16” end wrench.

Belt Adjustment

The tension spring in the traveler keeps the belt taut. 

The factory setting for the tension spring length is .9” 

long. If the tension spring is longer than 1”, adjust the 

belt.

1

 

Hold the traveler so the adjustment wheel is visible 

through the large slot.

2  Use a flat blade screwdriver to turn the adjustment 

wheel to compress the tension spring until its length 

is between .9” and 1” long.

Every Year

Check the door hardware for lubrication needs. 

Lubricate door hinges, rollers and bearings according 

to door manufacturer’s recommended procedures.

20  Field Reset

21  Troubleshooting – Operator

FCC NOTICE

Changes or modifications not expressly described in this manual or approved by the manufacturer could void the user’s authority to operate the equipment.
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Industry Canada and Part 15 of the FCC Rules. These limits 
are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency 
energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that 
interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by 
turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

•  Reorient or relocate the receiving antenna.
•  Increase the separation between the equipment and receiver.
•  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•  Consult the dealer or an experienced radio/TV technician for help.

LIMITED WARRANTY

This product is warranted to the original consumer against defects in material and workmanship for:

 

MODEL 

ELECTRONICS 

MECHANICAL 

MOTOR 

BELT 

CHAIN

 

LDCO850 

1 year 

5 years 

Lifetime 

Lifetime 

5 years

This product is warranted to the original consumer against defects in material and workmanship for the periods mentioned above. The manufacturer will repair, or 
at its option, replace, any device that it finds requires service under this warranty, and will return the repaired or replaced device to the consumer at manufacturer’s 
cost. Devices must be sent to manufacturer for service at owner’s expense. This warranty does not apply to damage to the product from negligence, abuse, abnormal 
usage, misuse, accidents, normal wear or tear or due to failure to follow Seller’s instructions, or arising from improper installation, storage or maintenance. In no event 
will manufacturer be responsible for incidental, compensatory, punitive, consequential, indirect, special or other damages. The remedies provided by this warranty are 
exclusive. Some states do not allow the exclusion or limitation of incidental and consequential damages, so the above limitation or exclusion may not apply to you. Any 
warranties implied by law are limited to the time periods set forth above. Some states do not allow limitations on how long an implied warranty lasts, so the above 
limitation may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
For warranty service and shipping instructions contact manufacturer at the phone number shown below. In order to be protected by this warranty, save your proof of 
purchase and send a copy with equipment should repair be required. All products returned for warranty service require a Return Product Authorization Number (RPA#). 
Contact Technical Services at (800) 543-1236 for an RPA# and other important details.

IF PROPERLY

BALANCED, THE 

DOOR WILL STAY AT A 

HALFWAY POSITION

IF PROPERLY

BALANCED, THE 

DOOR WILL STAY AT A 

HALFWAY POSITION

Copyright © 2017 GTO Access Systems, LLC 

Document Number: 10014542  REV B (06-20-17)

IMPORTANT USER SAFETY INSTRUCTIONS

 WARNING 

A MOVING GARAGE DOOR CAN CAUSE INJURY OR DEATH! 

TO REDUCE THE RISK OF DEATH OR SEVERE INJURY:

1  READ AND FOLLOW ALL INSTALLATION INSTRUCTIONS.
2  NEVER LET CHILDREN OPERATE, OR PLAY WITH DOOR CONTROLS! KEEP REMOTE CONTROL AWAY FROM CHILDREN!
3  Always keep moving door in sight and away from people and objects until it is completely closed. 

NO ONE SHOULD CROSS THE PATH OF THE MOVING DOOR.

4  NEVER GO UNDER A STOPPED, PARTIALLY OPEN DOOR.
5  Test door operator monthly. The garage door MUST reverse on contact with a 1-1/2 inch object (or a 2x4 board laid flat 

at the center of the door) on the floor. If adjusting either the force or the limit of travel, re-test the door operator. Failure 
to adjust the operator properly may cause severe injury or death.

6  If possible, use the red emergency release handle only when the door is closed. Use caution when using this release with 

the door open. Weak or broken springs may cause the door to fall rapidly, causing injury or death.

7  KEEP GARAGE DOORS PROPERLY BALANCED. (See Garage Door Operator Maintenance) An improperly balanced door 

could cause severe injury or death. Have a qualified service person make repairs to cables, spring assembly and other 
hardware.

8  This operator system is equipped with an unattended operation feature. The door could move unexpectedly. NO ONE 

SHOULD CROSS THE PATH OF THE MOVING DOOR. Only use the Smart Control wall station for unattended operation when 
installed with a sectional residential overhead door.

9

 

SAVE THESE INSTRUCTIONS.

 WARNING 

The garage door operator must not be 

installed and used on an unbalanced door. The 

operator’s internal door force sensor will not 

function properly on an unbalanced door. Risk 

of serious injury or death may result.

 WARNING 

Garage door hardware (springs, cables, 

brackets, pulleys, etc.) are under extreme 

pressure and tension. DO NOT ATTEMPT 

TO LOOSEN, TIGHTEN OR ADJUST ANY DOOR 

HARDWARE. CALL A QUALIFIED GARAGE DOOR 

INSTALLATION PROFESSIONAL!

 WARNING 

Always perform the Safety Reversal System 

Test (see Section 16) after making any 

adjustments to the operator.

PRESS THE

WALL STATION'S

UP/DOWN ARROW

PRESS A REMOTE

CONTROL BUTTON

OPENING OR CLOSING THE DOOR

- OR -

- OR -

ENTER AN

ACCESS CODE

AND PRESS

WALL STATION

REMOTE CONTROL

REMOTE

KEYPAD

WHENEVER OPERATING
THE LIGHT WILL TURN ON

FOR ABOUT 5 MINUTES

NOTE: A FLASHING

LIGHT INDICATES

TROUBLE

SAFETY LIGHTING

WALL

STATION

REMOTE

KEYPAD

REMOTE

CONTROL

THE DOOR CAN BE STOPPED
AT ANY POSITION USING THE

WALL STATION, REMOTE CONTROL,

OR A REMOTE KEYPAD

STOPPING THE DOOR

FLIP THE LARGE BUTTON UP TO 
ACCESS PROGRAMMING BUTTONS. 
PRESS THE LOCK (    ) BUTTON TO 
PREVENT REMOTES FROM OPENING
THE GARAGE DOOR. PRESS IT AGAIN 
TO UNLOCK, ALLOWING REMOTES TO
OPEN GARAGE DOOR. 

PREVENTING REMOTES FROM OPENING DOOR

PRESS THE LIGHT BUTTON TO TURN
THE LIGHT ON OR OFF.

THE LIGHT WILL STAY ON UNTIL THE
LIGHT BUTTON IS PRESSED OR THE
OPERATOR IS CYCLED.

CONTROLLING THE OPERATOR’S LIGHT

IF DOOR BECOMES OBSTRUCTED,

PULL DOWN ON HANDLE

NOTICE

IF DOOR BECOMES OBSTRUCTED,

PULL DOWN ON HANDLE

NOTICE

IN CASE OF POWER FAILURE
OR IF DOOR BECOMES OBSTRUCTED

PULL THE RED

RELEASE HANDLE

TO DISCONNECT

THE OPERATOR

FROM THE

DOOR

FLIP THE LEVER UP

AND RAISE OR

LOWER THE DOOR

TO RECONNECT

THE OPERATOR

TURNBUCKLE
LOCKNUTS

TO HEAD LOCKNUTS

TIGHTEN

LOCKNUTS

LOOSEN

HOLD TURNBUCKLE
WITH FLAT BLADE
SCREWDRIVER TO
BACKUP LOCKNUTS

TWIST

TURNBUCKLE

CHAIN

TIGHTEN CHAIN

LOOSEN

ADJUSTING A CHAIN-DRIVE

ADJUSTING A BELT-DRIVE

TIGHTEN

LOOSEN

TURN THE ADJUSTMENT
WHEEL UNTIL THE TENSION
SPRING IS ABOUT 1" LONG

ADJUSTMENT WHEEL

MEASURE THE TENSION
SPRING LENGTH

TRAVELER

IF DOOR BECOMES OBSTRUCTED,

PULL DOWN ON HANDLE

NOTICE

IF DOOR BECOMES OBSTRUCTED,

PULL DOWN ON HANDLE

NOTICE

TO DISCONNECT OPERATOR

PULL THE RED
RELEASE HANDLE

TO DISCONNECT
THE OPERATOR

FROM THE
DOOR

FLIP THE LEVER UP
AND RAISE OR

LOWER THE DOOR

TO RECONNECT
THE OPERATOR

TO RECONNECT OPERATOR

In installations where the door spring, door, or hardware 

is being replaced, and the operator was already 

programmed for the old door, reset the operator’s 

settings using the following steps.
1

 

Press and hold down the UP, DOWN, and LEARN 

buttons at the same time for ten seconds. The red 

and green indicators and the operator’s light will 

flash twice.

2

 

Release the buttons. The operator will reset force 

settings and erase all set limits, 

but will still retain 

all programmed transmitters in memory.

3

  AFTER PERFORMING A FIELD RESET, BOTH THE 

OPEN AND CLOSE LIMITS MUST BE ADJUSTED 

AND THE AUTOMATIC DOOR FORCE SETUP 

COMPLETED BEFORE THE OPENER WILL 

FUNCTION.

18 Using the Garage Door Operator

Opening the Door

1  With the door in view, press the wall station’s UP/

DOWN ARROW button or the button assigned to 

the operator on the remote control, or enter a valid 

access code and press START/STOP on a remote 

keypad.

2  When the operator is activated, the operator’s light 

will turn on and the door will begin to open.

3  The door will open until the open limit is reached. If 

an obstacle is encountered (operator’s light flashes 

four times and the alarm beeps four times) while the 

door is opening, the door will stop.

4  The operator’s light will stay on for about five minutes 

after the door stops.

Closing the Door

1  With the door in view, press the wall station’s UP/

DOWN ARROW button or the button assigned to 

the operator on the remote control, or enter a valid 

access code and press START/STOP on a remote 

keypad.

2  When the operator is activated, the operator’s light 

will turn on and the door will begin to close.

3  The door will close until the close limit is reached. 

If an obstacle is encountered (operator’s light 

flashes four times), or the safety beam is interrupted 

(operator’s light flashes three times) during closing, 

the door will stop, then re-open.

4  The operator’s light will stay on for about five minutes 

after the door stops.

Stopping the Door Mid-travel

1  The door can be stopped immediately at any time by 

pressing the wall station’s UP/DOWN ARROW button, 

the remote control’s pushbutton, or press the START/

STOP button on a remote keypad (if the remote 

keypad was used to start the door).

2  The next time the operator is activated, the door will 

move in the opposite direction.

Vacation Lock for Additional Security

1

 

Flip the large button up to access the wall station’s 

programming buttons. Press the LOCK button to 

prevent remote controls from opening the door after 

the door is completely closed. The blue LED on the 

wall station will flash while the Vacation Lock is 

active. The remotes can close the door, but not open 

it. The door can still be opened or closed by using the 

wall station’s UP/DOWN ARROW pushbutton.

 

NOTE:

 To signal that the vacation switch is locked, 

the operator’s light and red light will flash five times if 

a remote is activated in an attempt to open the door.

2

 

Press the wall station’s LOCK button again to return 

the operator to normal operation.

Controlling the Operator’s Light

1

 

The operator’s light can be lit by pushing the wall 

station’s LIGHT button. The light will remain on until 

the LIGHT button is pressed again or the operator is 

cycled.

2  If the operator’s light is on, pushing the wall station’s 

LIGHT button will turn the operator’s light off.

Disconnecting the Door from the Operator

1

  

With the door in any position (preferably closed), 

carefully pull the red release handle. 

USE CAUTION 

IF THE DOOR IS OPEN, THE DOOR MAY DROP.

2 The disconnected door can be opened or closed 

manually.

3

  

To re-connect the operator, flip the release lever up. 

Raise or lower the door manually until the operator 

reconnects.

Flash/Beep 

Trouble Code

Problem

Cause

Solution

1

No Problem

Remote control entered into memory

Add any additional remote controls

2

Door won’t operate

Shorted wall station wires

Check wall station wires. Be sure both are connected to the 
terminal screws. Check for a staple in the wall station wires. 
Remove any staples compressing the wire. Check for frayed wires. 

3

Door won’t close

Safety beam obstacle

Check for obstacles. Align the safety beams.

4

Door reverses or won’t 
open or close

Open or close force exceeded

Check for obstruction or binding of the garage door. Adjust force 
factor if necessary. Perform a field reset if necessary. 

5

Door won’t open from 
remote control

Remote was activated while in vacation 
mode

Activate vacation mode switch on wall station to exit vacation 
mode. 

6

Limit error

Down limit and up limit are set too close 
together

Re-set the open and close limits. If error occurs again, contact a 
qualified garage door professional.

7

Door reverses or won’t 
open or close

Encoder has detected an error

Check for obstruction or binding of the garage door. If error occurs 
again, contact a qualified garage door professional.

Number of Beeps

Problem

Cause

Solution

2

Low battery

Battery is low

Check that AC power is connected and allow battery to charge. It will 
take approximately 10 hours to charge the battery. 

4

No capacity

Battery is no longer holding a charge.

Replace battery now

5

Battery shorted

Battery is internally shorted or battery 
leads are shorted. 

Check battery wires for shorting. If wires are ok, replace battery now.

Troubleshooting – Battery

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