Chapter 6: Alarms and System Failure Codes
System Failure Codes
Service Manual 6-21
6.2.23 System Failure 27
System failure 27 indicates: Defective non-volatile memory.
6.2.24 System Failure 28
System failure 28 indicates: During operation, the SBC board lost communication with control board.
6.2.25 System Failure 29
System failure 29 indicates: Defective signal on control board.
Cause(s) Action(s)
Defective circuit on control
board
Replace the control board.
Cause(s) Action(s)
Refer to system failure 0. Power down the device, during the self-test the device should detect
system failure 0. Follow the instructions for system failure 0.
Defective flat ribbon cable
between control board and
SBC board.
If system failure 28 persists without system failure 0, replace the flat
ribbon cable between control board and SBC board.
Cause(s) Action(s)
Defective control board Replace the control board.