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AERCO BMK 2.0 LN Natural Gas 2008 User Manual

Page 75

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APPENDIX B

TABLE B-2. FAULT MESSAGES - Continued

FAULT MESSAGE

FAULT DESCRIPTION

RESIDUAL

FLAME

The Flame signal was seen for more than 60 seconds during
standby.

HEAT DEMAND

FAILURE

The Heat Demand Relays on the Ignition board failed to
activate when commanded.

IGN BOARD

COMM FAULT

A communication fault has occurred between the CPU board
and Ignition board.

DIRECT DRIVE
SIGNAL FAULT

The direct drive signal is not present or is out of range.

REMOTE SETPT

SIGNAL FAULT

The remote setpoint signal is not present or is out of range.

OUTDOOR TEMP

SENSOR FAULT

The temperature measured by the Outdoor Air Sensor is out
of range.

OUTLET TEMP

SENSOR FAULT

The temperature measured by the Outlet Sensor is out of
range.

FFWD TEMP

SENSOR FAULT

The temperature measured by the FFWD Sensor is out of
range.

HIGH WATER

TEMPERATURE

The temperature measured by the Outlet Sensor exceeded
the Temp Hi Limit setting.

LINE VOLTAGE

OUT OF PHASE

The High AC voltage is out of phase from the low AC voltage.

STEPPER MOTOR

FAILURE

The stepper motor failed to move the valve to the desired
position.

NETWORK COMM

FAULT

The RS-485 network information is not present or is
corrupted.


B-3