Chamberlain RJO20C Manual page 34

Troubleshooting
Troubleshooting
The garage door opener doesn't operate from either the Door Control or the remote control:
• Does the garage door opener have electric power? Plug a lamp into the outlet. If it doesn't light, check the fuse box
or the circuit breaker. (Some outlets are controlled by a wall switch.)
• Have you disabled all door locks? Review installation instruction warnings on page 8.
• Is there a build-up of ice or snow under the door? The door may be frozen to the ground. Remove any restriction.
• The garage door spring may be broken. Have it replaced (see page 4 for reference).
• If the yellow command LED does not turn on, reverse the wires connected to the RED and WHT terminals of the
control panel. Replace wire if necessary.
The yellow and red LEDs on the Door Control are blinking quickly:
• The control panel is charging, and may take up to 5 minutes to become operational.
My remote control will not activate the garage door:
• Verify the lock feature is not activated on the door control.
• Reprogram the remote control.
• If the remote control will still not activate the door check the diagnostic codes to ensure the garage door opener is
working properly.
The remote control has short range:
• Change the location of the remote control in your car.
• Some installations may have shorter range due to a metal door, foil backed insulation, or metal garage siding.
The door doesn't open completely:
• Check power door lock.
• Is something obstructing the door? Is it out of balance, or are the springs broken? Remove the obstruction or repair
the door.
The door opens but won't close:
• Check cable tension monitor (see Installation Step 6 on page 13).
• If the garage door opener lights blink, check the safety reversing sensor (see Installation Step 9 on page 17).
• If the garage door opener lights don't blink and it is a new installation (see Adjustment Step 2 on page 23). For an
existing installation, see below.
Repeat the safety reverse test after the adjustment is complete.
The door reverses for no apparent reason and garage door opener lights don't blink:
• Check cable tension monitor (see Installation Step 6 on page 13).
• Is something obstructing the door? Pull the emergency release handle. Operate the door manually. If it is unbalanced
or binding, call a trained door systems technician.
• Clear any ice or snow from the garage floor area where the door closes.
• Review Adjustment Step 2 on page 23.
Repeat safety reverse test after adjustments.
My door will not close and the light bulbs blink:
The safety reversing sensor must be connected and aligned correctly before the garage door opener will move in the
down direction.
• Verify the safety sensors are properly installed, aligned and free of any obstructions.
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.
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