LiftMaster JDC Installation Manual - English French Spanish - Page 51

Troubleshooting (continued) Code Display Message F04 F04 UNAUTH. STOP (end) F08 F08 NO CONFIG F14 F14 SET LIMITS Description Possible Causes Diagnosis Resolution No motor motion was detected when the operator was attempting to move the motor. Worn motor brushes Motor DC resistance should be less than 3 ohms. If it is greater than 3 ohms, the brushes may fail to maintain contact with the commutator internal to the motor. Replace motor Replace motor brushes (extended duty models only) Powerhead main board motor drive fault Measure DC voltage across motor terminals at main board. In idle state, voltage should be 0. Activate door operator with open/ close. Voltage may vary over a wide range, from several volts up to about 40 volts DC. If voltage is absent during activation, check for other fault codes and correct as necessary. If no other fault codes are present, power cycle the operator and try again. If fault persists, reset settings to factory defaults and reconfigure the operators. If fault still persists, replace main board. Encoder wiring fault Inspect encoder cable for disconnection, bad connection, cut cable, etc. Correct any issues found with encoder wiring Encoder fault or encoder interface fault Go to limit learn process. Number displayed while in door limit learn mode is the encoder position. Jog door several inches in either direction and release button. Number displayed should change. Make sure to cancel changes or set limit again when finished. If encoder position does not change with door movement, the encoder, encoder wiring, and powerhead main board are suspect. Check all three for any visible damage. Attempt power cycling and restoring factory defaults. Replace or repair suspected faulty components. Motor drive fault occurred Check for other fault Review other fault codes codes and perform problem resolution as necessary. Configuration was not found or was reset to factory setting New operator is not configured. If the operator is new, Configure the operator the configuration is per the normal process. initially unset. Operator was factory reset from the menu If the operator is factory reset, the configuration will be unset. Configure the operator per the normal process. End positions are not set or stored Limits were never New product as set out of box shipped does not have any limits set Learn door limits Settings were F14 error reset or invalidated from the menu 51 Re-learn door limits