Chamberlain GA400D, Owner'S Manual

Operation and Maintenance 

40

SYMPTOM POSSIBLE 

SOLUTION

Operator does not run.  

• Power not connected. Make sure the AC/Solar input is connected and that at least  

Diagnostic LED not on. 

  one battery is connected with the corresponding fuse intact.

 • 

Low or defective battery. Check the battery to make sure that the red wire goes to 
the positive terminal of the battery and the black wire goes to the negative terminal 
of the battery. Replace the battery if the open circuit voltage is below 11.5Vdc.

 • 

Bad control board. Call technical support for more options.

Operator powers up but  

• Low or defective battery. At least one charged battery must be connected for the  

does not run. 

  unit to operate. Verify the battery fuse is intact. Check battery connections and   

  battery voltage to be above 11.5V Replace batteries if necessary.

 • 

STOP button connection loose or disconnected. Press the RESET button and verify 
that the STOP LED lights up and then turns off after 10 seconds. Verify the wire 
connects between the STOP and CTRL PWR terminals.

 • 

Obstruction blocking safety sensors. Press the RESET button and verify that all the 
safety LEDs (OPEN EDGE/PHOTO, OPEN PHOTO, CLOSE PHOTO) are OFF. If 
any are ON, clear any obstructions and verify the LED turns off 

NOTE:

 The RESET button may need to be hit multiple times since the LEDs turn  

  off after 10 seconds when the unit goes to sleep.

 • 

(Optional Accessory) Safety edge is damaged or on an obstruction. Press the 
RESET button and verify that the Safety LEDs (OPEN EDGE and CLOSE EDGE/
PHOTO) are OFF. If either is ON, clear any obstructions and verify the LED turns 
off.

NOTE:

 The RESET button may need to be hit multiple times since the LEDs turn  

  off after 10 seconds when the unit goes to sleep.

•  (Optional Accessory) Interrupt loop or Shadow loop is obstructed. Press the RESET 

button and verify that the INTERRUPT and SHADOW LEDs are OFF. If either is on, 
check the loop detector and its wiring to insure that it is not incorrectly being 
triggered.

 • 

Bad control board. Call technical support for help with replacement parts.

Relays “click” when remote 

• Battery not connected. At least one charged battery must be connected for the unit

control or single button 

  to operate. Verify battery fuse is intact. Check battery connections and battery

control (SBC) command 

  voltage to be above 11.5V. Replace batteries if necessary.

is given, but the operator 

• Arm cable loose or disconnected. Verify that all of the wires, especially the red and 

does not move. 

  blue wires, going to the arm are secure and that the connector is properly mated to  

the 

header.

 • 

Arm is jammed or incorrectly installed. Disconnect the motor housing from the arm 
and verify that the arm moves freely. With the motor housing still disconnected, 
enter the Learn Limits mode and verify that the motor spins. Reconnect the motor 
housing to the arm and make sure that all 4 screws are securely tightened and that 
the motor seats correctly against the worm drive. Relearn limits for the operator.

 • 

Bad control board. Call technical support for help with replacement parts.

Troubleshooting