LiftMaster JDC Installation Manual - English French Spanish - Page 60

Troubleshooting (continued) Code Display Message Description Possible Causes Diagnosis Resolution F95 F95 MOTOR Message with Powerhead Fault is internal to the Power cycle the operator. COMM invalid format main board powerhead main board. received from firmware glitch See resolution. If the issue persists, reset the motor MCU. or hardware settings to factory defaults and damage. reconfigure the operator. F96 F96 INTR LOCK If the issue still persists, replace powerhead main PCBA. INTR LOCK circuit was broken Hoist is engaged Check that the hoist mechanism is disengaged. Pull the green rope to disengage the hoist. Motor drive circuit is disabled when the INTR LOCK circuit is open. INTR LOCK circuit consists of the INTR LOCK wiring terminals and the hoist chain interlock switch. Operators without a hoist include a jumper to bypass the hoist chain interlock switch connections. INTR LOCK devices disconnected or missing Hoist switch cable or hoist switch jumper disconnected or missing Device connected to INTR LOCK terminals is open or INTR LOCK device is faulty Wiring fault Check to ensure INTR Reconnect INTR LOCK devices. LOCK devices are properly connected to the If no INTR LOCK devices are INTR LOCK terminals intended to be used, then place INTR LOCK terminals a wire jumper between both should have jumper terminals. placed if no devices are connected. Check to ensure hoist switch or jumper are properly connected. Correct any wiring issues with the hoist switch cable or hoist switch jumper. Check that any devices connected to INTR LOCK terminal are in their normal, closed state to allow the operator to move Restore INTR LOCK devices to their normal state. If a faulty device is attached, repair or replace the device. Check for open circuit or If any wiring fault is found, short circuit wiring faults correct the fault. for the INTR LOCK wiring. F101 F101 BBU LOW Battery is present but discharged (voltage is low) Damaged powerhead main board Disconnect INTR LOCK devices and replace with jumper. If fault goes away, issue is not with powerhead main board. If the main board still won't resolve the fault with a jumper connected directly to the board, the fault may exist with the main board. Backup battery is discharged due to loss of AC power. Check to ensure that AC power is present and in normal operating range for the operator Battery is worn Batteries can be tested out or has failed with a suitable battery tester. Older batteries are more likely to be worn out, as are batteries that are used often. Attempt power cycling the unit and, failing that, resetting to factory defaults. If problem still persists, replace the main board. Restore AC power and ensure battery recharges properly Replace batteries. Always replace both batteries as a set. Do not mix old and new batteries or use mismatched types. 60