• Code: 621
• Description: Communication error – FCI I2C
  The engine board detected an unknown device on the I2C I/F bus (internal bus on the engine control board). The engine board detected an I2C I/F bus error. The number of devices connected to the I2C bus exceeded 12.
• Causes: • Engine board defectiveI I2C

• Code: 634
• Description: Key/card counter device error 3
  The backup battery of the counter device RAM is low.
• Causes: • Replace the RAM backup battery.

• Code: 635
• Description: Key/card counter device error 4
  After installation of the device a message alerts user to a battery voltage abnormal error.
• Causes: • Device control board defective • Device control board backup battery defective

• Code: 650
• Description: Communication error – GAVD I2C
  The engine board detected an unknown device on the I2C I/F bus (internal bus on the engine control board). The engine board detected an I2C I/F bus error. The number of devices connected to the I2C bus exceeded 12.
• Causes: • Engine board defective

• Code: 651
• Description: Communication error – FCI I2C
  The engine board detected an unknown device on the I2C I/F bus (internal bus on the engine control board). The engine board detected an I2C I/F bus error. The number of devices connected to the I2C bus exceeded 12.
• Causes: • Engine board defectiveI I2C

• Code: 669
• Description: NVRAM Error
  The NVRAM was not connected at power on, or read/write operations on the NVRAM failed.
• Causes: • NVRAM connected improperly • NVRAM missing

• Code: 670
• Description: Engine startup error
  The BCU failed to respond with the prescribed time when the machine was turned on.
• Causes: • Connections between BCU and controller board are loose, disconnected, or damaged • Replace the BCU • Replace the controller board

• Code: 672
• Description: Controller startup error
  After power on, the line between the controller and the operation panel did not open for normal operation. After normal startup, communication with the controller stopped.
• Causes: • Controller stalled • Controller installed incorrectly • Controller board defective • Operation panel harness disconnected or defective