Nortec NH-EL Series - Manual (Page 79)

Troubleshooting | 76
Table 11: Troubleshooting Warnings and Faults
Display Message LED
System
Detected
Cause Corrective Action(s)
BMS
BACnet
Nortec Online
Staged
Modulation
Warning/Fault
Red
No Modbus/
BACnet / Nortec
Online / Multi
Mode signal
1 Loose connection 1 Check connections and
polarity of wires.
2 Incorrect
Modbus/BACnet/IP
address or
configuration.
2 Check that address of
humidifier matches that
of network.
3 Humidifier configured
but not connected to
network
3 Configure controls
correctly in “Control
Setting” level of
software (see Operation
Chapter).
4 Improper wire used 4 Use 120 Ohm
impedance shielded
twisted pair cable for
Modbus, Cat 5 for
BACnet IP/ IP.
5 Noise preventing
humidifier from
detecting signal.
5 Eliminate source of
noise causing
interference.
Control Signal
Warning / Fault
No signal from
RH control
sensor
No signal from
RH Limit sensor
1 Sensor not powered 1 Use multimeter to
check that sensor is
powered.
2 Sensor not wired
correctly
2 Check wiring is secure
and wired correctly per
instructions in
installation chapter.
3 Defective sensor 3 Check if sensor output
is corresponding to RH.
If not replace the
sensor.
Red
4 RH less than 5% 4 RH less than 5% are
interpreted as a broken
sensor. Contact
NORTEC Representative
for recommendation.
Red
5 Humidifier control
configuration incorrect
5 Check that the
humidifier control
configuration matches
the installed sensor
output.
Current Off Fault Red
Current detected
with no demand
1 Contactor seized closed 1 Open Disconnect, check
if contactor is closed
2 Driver Board out of
Calibration
2 If display indicates
output with contactor
open, then replace the
driver board.