Nortec MH Series - Manual (Page 79)

Troubleshooting | 76
Code Display
Message
LED System Detected Cause Corrective Action(s)
W28A
Maintenance
Red
Flash
and
Yellow Maintenance
interval has
elapsed
1 Maintenance is due 1 Perform maintenance
according to Table 4
then reset “Stages
Reset” in Maintenance
menu.
E28A
Red
and
Yellow
2. Maintenance
reminder not reset
after performing
maintenance
2 Reset the “Stages
Reset” reminder in the
Maintenance menu.
W29A
UV
Maintenance
Red
Flash
and
Yellow
Maximum life
span of UV bulb
reached
1 Life span of UV bulb
reached
1 Replace UV bulb then
reset the “UV Lamp
Rst.” reminder in the
Maintenance menu.
E29A
Red
and
Yellow
2. Reminder not reset
after installing new UV
bulb.
2 Reset the “UV Lamp
Rst.” reminder in the
Maintenance menu.
W32A
HumSensor
broken
Red
Flash No signal from
RH sensor
1 Sensor cable not
connected or broken
1 Connect / replace
sensor cable.
E32A Red
2 Humidity sensor
defective
2 Replace humidity
sensor.
W33A
μS Sensor
broken
Red
Flash
No signal from
conductivity
sensor
1 Sensor cable not
connected or broken
1 Connect / replace
sensor cable.
2 Conductivity
transmitter defective
or wrong version
(conductivity constant)
2 Replace Conductivity
transmitter.
E33A Red
3 Conductivity
transmitter not
configured correctly
3 Contact your Nortec
supplier.
4 Conductivity sensor
defective.
4 Replace conductivity
sensor
W34A
Modbus disable
Red
Flash
MH deactivated
via Modbus
1 MH deactivated via
modbus
1 May be normal
operation. Contact
network manager if
humidity/cooling
required.
E34A Red
2 Modbus system
failure.
2 Contact network
manager. Check /
activate Modbus
network.
E35A
Modbus
Timeout
Red
No
Communication
with Modbus
network
1 Incorrect wiring 1 Check that wiring meets
RS485 networking
requirements.
2 Wrong Modbus
configuration
2 Check modbus address
and parity.
3 Modbus Network down 3 Activate Modbus
network