Nordic ATWC Series, Installation And Service Manual, Page: 61 / 106

PRELIMINARY: 24-Sep-2021 Page 61 002536MAN-00
FAULT TROUBLESHOOTING
Alarm/Fault Description Recommended Action
Digital Inputs
A failure has occurred and the indicated section of the
control board may no longer work properly.
Cycle the power a few times; if the
fault persists replace the control
board.
Digital Outputs
Analog Inputs
MODBUS Comms
Real Time Clock
Flash Memory A failure has occurred and stored data may be corrupt. It may be possible to correct this by
using the menu item
Tools—Reset to
Factory Defaults
. If this clears the
fault then the system configuration will
have to be set up again.
Menu Buttons A failure has occurred and the control board may no
longer respond to menu button key presses.
Try turning off the power, disconnect-
ing and reconnecting the cable be-
tween the LCD Display board and the
Control Board, and then turning the
power back on again. If this does not
work then either the LDC Display
board, the cable, or the driver section
of the Control Board may be faulty.
LCD Display
A failure has occurred and display may show erratic da-
ta, no data or may not turn on at all.
Temperature
Sensors
The sensor is reading outside of the acceptable range.
Check to ensure connector is on securely.
Replace the temperature sensor. If
this does not rectify the problem re-
place the control board.
PWM Outputs
BACnet Comms
BACnet communications experienced a timeout. Verify BACnet parameters in the PC
App’s Tools-->Configuration
Pressure Sensors The sensor is reading outside of the acceptable range.
Check to ensure connector is on securely.
Replace the pressure sensor. If this
does not rectify the problem, replace
the control board.