NuAire LabGard NU-581-400, Operation And Maintenance Manual

Page: 73 / 107

OM0302
Rev 2/December 2020 Page 73 of 107
8.1 Error Message Troubleshooting Guide
Error Message Indicator Correction
 Window Alarm
(Window High)
Sliding window is above its standard working
height or micro switch is not operating properly.
Verify standard working height and window micro switch
operation.

Window Alarm
(Window Low)
Sliding window is below its standard working
height or micro switch is not operating properly.
Verify standard working height and window micro switch
operation.
 Airflow Alarm
 Red Downflow Arrow
(Downflow Low Limit)
Downflow airflow fell below its lower limit alarm
setpoint.
Re-certify cabinet to proper airflow setpoints.

Airflow Alarm

Red Downflow Arrow
(Downflow High Limit)
Downflow airflow went above its high alarm
setpoint.
Re-certify cabinet to proper airflow setpoints.

Airflow Alarm
 Red Inflow Arrow
(Inflow Low Limit)
Inflow airflow fell below its lower limit alarm
setpoint.
Check orientation of exhaust sensor shroud.
Re-certify cabinet to proper airflow setpoints.
 Airflow Alarm

Red Inflow Arrow
(Inflow High Limit)
Inflow Airflow went above its high alarm
setpoint.
Check orientation of exhaust sensor shroud.
Re-certify cabinet to proper airflow setpoints.
 Low Pressure Alarm
(Low pressure Limit)
Indicates low pressure or low cabinet airflow Re-certify cabinet to proper airflow setpoints.
Cabinet LED lights
won't turn on.
Check light fuse on main control board.
Check LED lamps.
Check voltage coming out of main control bd. to light ballast's.
Check light starters, if present.
Check ballast.
Cabinet blower
won't turn on.
Check blower fuse on main control board.
Check AC voltage coming out of main control bd.
Check wiring to blower.
Check blower motor.
Check DC motor PWM signal on main control bd.
Display indicates
(Remote Override
Active)
Indicates that the remote
override is activated,
preventing the usage of the cabinet
Power Loss Alert! Indicates a power interruption has occurred. Press display to clear message.
Cabinet outlets
won't turn on.
Check outlet fuse located on main control board.
Check voltage coming out of main control board.
Cabinet ultraviolet light
won't turn on.
Check sliding window position so that it's fully closed.
Check blower/lights fuse on main control board.
Check voltage coming out of the main control bd. to ultraviolet
light ballast.
Check light starters, if present.
Check ballast.
Blower or light fuse
continues to blow
after replacement.
Check for short on output of fuse.
Isolate output of fuse by disconnecting control center
connectors, light circuit, AC or DC blower circuit, etc. to isolate
short.
Replace UV Light! Indicates that the UV light needs replacement Replace UV light and clear UV run time clock.
Display indicates
(Night Setback Active)
Indicates that the night setback is activated,
preventing the usage of the cabinet.
Power window option is
malfunctioning.
Window does not open and close correctly.
Try to fully open the window to initiate the self-calibration
feature. Activate the auto-reverse function by placing a soft
object, i.e. rubber stopper under window and lower until
window auto reverses and is raised to its self-calibrating point.
Re-calibrate power window memory points.
Active Alarms
DN Sensor Comm!
EX Sensor Comm!
Indicates a digital communications error from
the main control board to the airflow sensors.
Check connectors and wires from main control board to the
airflow sensors.
DN indicated downflow sensor.
EX indicates exhaust sensor.
Active Alarms
DN Sensor Error!
EX Sensor Error!
Indicates an error signal generated by the
sensor.
Check airflow probe connector on main board. (Ref. Section
7.11). Replace airflow sensor if required.