• Code: E744-0004
• Description: The boot ROM and the firmware have a mismatch of model or type:
  at time of start-up, the language file cannot be read.

• Code: E744-1000
• Description: The boot ROM and the firmware have a mismatch of model or type:
  at time of start-up, the bottom ROM product name is found to be a mismatch

• Code: E744-2000
• Description: The boot ROM and the firmware have a mismatch of model or type:
  at time of start-up, the serial number of the serial number PCB is an undefined code.

• Code: E804-0000
• Description: The wiring is faulty (short circuit, open circuit). The DC power supply fan (FM6) is faulty. The DC controller PCB is faulty.
  While the DC power supply fan is being driven, the clock signal (FM6CLK) does not arrive for 5 secs or more.

• Code: E805-0001
• Description: The wiring is faulty (short circuit, open circuit). The feed fan (FM1) is faulty. The heat discharge fan (FM3) is faulty. The DC controller PCB is faulty.
  While the heat discharge fan is being driven, the clock signal (FM3CLK) does not arrive for 5 secs or more.

• Code: E805-0002
• Description: The wiring is faulty (short circuit, open circuit). The feed fan (FM1) is faulty. The heat discharge fan (FM3) is faulty. The DC controller PCB is faulty.
  While the feed fan is being driven, the clock signal (FM1CLK) does not arrive for 5 secs or more.

• Code: E824-0000
• Description: The wiring is faulty (short circuit, open circuit). The primary charging assembly cooling fan (FM2) is faulty. The DC controller PCB is faulty.
  While the primary charging assembly cooling fan is being driven, the clock signal (FM2CLK) does not arrive for 5 secs or more. PCB.