AERCO BMS II BOILER - Manual (Page 71)

APPENDIX B
B-1
APPENDIX B
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STATUS AND FAULT MESSAGES
DISPLAY MESSAGES DESCRIPTION
STATUS MESSAGES:
FAIL SAFE MODE
ACTIVATED The system is running in the Constant Setpt mode due to loss of the
Remote signal or Outdoor Air sensor input.
NETWORK DISABLED
MODBUS LISTEN “Forced Listen Only Mode” has been activated. All Modbus commands
except “restart Communications Options” will be ignored. The BMS II will
operate in the Fail Safe Mode.
OUTSIDE AIR TEMP
NOT CONNECTED The Outdoor Air Temperature Sensor is not installed and connected.
RETURN TEMP
NOT INSTALLED The Boiler Return Temperature Sensor is not installed.
FAULT MESSAGES
OUTDOOR SENSOR
ERROR The Outdoor Air Temperature Sensor signal is out of range.
HEADER SENSOR
ERROR The Header Temperature Sensor signal is out of range or disconnected.
RETURN SENSOR
ERROR The Return Temperature Sensor signal is out of range.
INTERLOCK 1
ERROR Interlock 1 input is open.
INTERLOCK 2
ERROR Interlock 2 input is open.
4 – 20 mA INPUT
ERROR The 4 – 20 mA Remote Input signal is lost.
MODBUS TIMEOUT
ERROR The Modbus remote input information was not received within the
network timeout period.