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Fault Codes & Troubleshooting Guide
LCD Fault
Icon
The ambient temperature has
Er3
exceeded the temperature
range (0
There is an incorrect
Er4
measurement or the sensor
has exceeded its lifespan
Er5
Er6
System problem
Internal data transmission
Er7
The accuracy of the CO
Er8
sensor may deviate from the
actual CO

LCD Display Symbols

Symbol
PPM
CO
2
c
DIAG
AL1
AL2
CALI
ReFactSet
w: www.duomo.co.uk
-
Description
o
o
C - 50
C)
EEPROM
flash, Fault LED
error
2
concentration
2
Meaning
CO
concentration (ppm)
2
Temperature (Celcius or Fahrenheit)
Alarm
Diagnostic check
First alarm
Second alarm
Calibration
Restore factory setting
Escape
High concentration
SEU
RDU
Indication
Indication
"Er3" flashes,
"Er3" flashes,
Fault LED
Fault LED
flashes, Alarm
flashes, Alarm
sounds
sounds
"Er4" flashes,
"Er4" flashes,
Fault LED
Fault LED
flashes, Alarm
flashes, Alarm
sounds
sounds
"Er5" & "Er6"
"Er7" flashes,
Fault LED
flashes, Alarm
flashes, Alarm
sounds
sounds
"Er7" flashes,
"Er7" flashes,
Fault LED
Fault LED
flashes, Alarm
flashes, Alarm
sounds
sounds
"Er8" flashes,
"Er8" flashes,
Fault LED
Fault LED
flashes, Alarm
flashes, Alarm
sounds
sounds
level
level
t: 01905 797989
-
-
Suggested Action
This error will disappear when
the temperature returns to
within the acceptable range
Power the unit down, then back
up. If "Er4" still appears, please
return the unit to the dealer
Power the unit down, then back
up. If "Er5" & "Er6" still appears,
please return the unit to the
dealer
Power the unit down, then
back up. Check the
communication cable
between the SEU and RDU
Power the unit down, then back
up. If "Er8" still appears, please
return the unit to the dealer
Description
Ambient CO
concentration
2
Ambient temperature
The unit is in alarm
The communications between the
SEU and RDU are being checked
CO
concentration exceeds the
2
first alarm level. The relay has been
activated
CO
concentration exceeds the
2
second alarm level. DO NOT
ENTER THE ROOM.
Calibrates the CO
sensor based on
2
ambient CO
concentration
2
Recovers factory default settings
The CO
level is above the second alarm
2
level. Action must be taken.
The CO2 concentration is above 5%
f: 01905 774296
© Duomo (UK) Ltd. 2016
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