Chamberlain RJO20 Manual page 35

Troubleshooting
Troubleshooting (Continued)
The door stops or reverses to open limit and the opener beeps and lights fl ash 5 times:
• Is something obstructing the door? Is it out of balance, or are the springs broken? Remove the obstruction or call a
trained door system technician to repair the door.
The garage door opener strains to operate door:
• The door may be out of balance or the springs may be broken. Close the door and use the emergency release handle
to disconnect the door. Open and close the door manually. A properly balanced door will stay in any point of travel
while being supported entirely by its springs. If it does not, disconnect the garage door opener and call a trained
door systems technician.
The garage door opener motor hums briefl y, then won't work:
• The garage door springs may be broken. See above.
• If the problem occurs on the fi rst operation of the garage door opener, door may be locked. Disable the power door
lock.
The garage door opener won't operate due to power failure:
• Manually open the power door lock.
• Use the emergency release handle to disconnect the door. The door can be opened and closed manually. When
power is restored, pull manual release a second time.
Door loses limits.
• Collar not tightened securely. Tighten collar (see Assembly Steps 1 and 2 on pages 9 and 10) and reprogram
limits (see Adjustment Step 1 on page 22).
The garage door opener moves when the door is in operation:
• Some minor movement is normal for this product. If it is excessive the collar will wear prematurely.
• Check to make sure the torsion bar is not moving left/right excessively.
• Check to make sure the torsion bar is not visibly moving up and down as it rotates.
• Check that the opener is mounted at a right angle to the jackshaft. If not, move the position of the mounting bracket.
Power lock makes noise when operating.
• Call Chamberlain ® for replacement power lock.
Safety sensor LED lights are not lit.
• The opener may be in sleep mode.
• The sensor LEDs will turn on when the opener is activated.
• If the sensor LEDs do not glow steadily when the opener is activated, see SAFETY SENSOR TROUBLESHOOTING
page 33.
(continued)
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