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Table 15 - Troubleshooting Guide - Part 2
Symptom Probable Cause Suggested Action
Door doesn't respond
to “Open” command,
but does respond to
“Close” command
Defective “Open” push-button or “Open limit
switch.
➔ Replace push-button or limit
switch.
Loose wire on “Open” push-button or
“Open” limit switch.
➔ Verify and correct wiring.
Door doesn't respond
to “Close” command,
but does respond to
“Open” command
Defective “Open” push-button or “Open limit
switch.
➔ Replace push-button or limit
switch.
Loose wire on “Open” push-button or
“Open” limit switch.
➔ Verify and correct wiring.
Door reverses to fully
open position after the
door closes and
reaches the floor
The “Close” limit switch is not being
engaged by travelling cam.
➔ The “Close” limit switch needs to
be adjusted properly at the end of
travel.
An “Open” command is being given. ➔ Verify “Open” push-button or any
opening device for short-circuit.
Door doesn't open or
close, motor hums or
blows the main breaker
Mechanical door lock is engaged. ➔ Release the door lock.
Door is jammed. ➔ Verify manual operation of door.
Brake doesn't release, if applicable. ➔ Verify and adjust brake tension.
Loose wire on solenoid brake, if applicable. ➔ Verify and correct wiring.
Faulty solenoid brake, if applicable. ➔ Replace.
Motor hums when
“Open” or “Close”
buttons are pressed
Loose motor wires. ➔ Verify and correct wiring.
Defective capacitor. ➔ Replace.
Motor fails to shut off
at fully closed or fully
opened positions
Defective limit switch. ➔ Operate limit switch manually while
door is moving. If door does not stop,
replace the switch.
Limit cams are not adjusted.
➔ Verify and adjust.
Limit drive chain is broken.
➔ Replace.
Loose sprocket on limit shaft.
➔ Tighten set screw.
Limit shaft does not rotate.
➔ Verify and replace accordingly.
Motor turns but door
does not move
Sprocket key is missing. ➔ Replace.
Drive chain is broken. ➔ Replace.
Clutch is slipping. ➔ Adjust clutch to proper tension.
Limit switches do not
hold their settings
Loose drive or limit chain. ➔ Adjust chain to proper tension.
Limit cam retaining bracket is not engaging
in the slots of the limit cams.
➔ Be sure it is engaged in slots of
both cams.
Limit cams are binding on shaft threads. ➔ Lubricate shaft threads. Limit cams
should turn freely.
Limit shaft has a slight “play”. ➔ Verify and adjust.
Poor radio range
Transmitter battery is low. ➔ Verify and replace battery.
Radio antenna is not properly positioned. ➔ Make sure antenna cable is not
bent. Cable should be passed through
control box.
Ambient radio, environmental or building
structure interference.
➔ Check connection of plug-in
antenna. If required, add an external
antenna (socket on receiver available).
For technical support, please call 1-800-361-2260 or visit www.manaras.com for more information
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