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page 4
The identified FRU is characterized by an identification number (ascending order from front to back) as
shown below and in the appendix.
The defective identified FRU is sent in a digital telegram depending of the way of communication
(Enumeration)
This same defect identification number is used when the LEDs flashes as follows:
LED code on the front panel
Identification #
Defective FRU
No LED active
NA
Power supply failure suspected or
probe power supply board
Red LED on for 5 seconds
Followed by an orange flash
1
Front panel board.
Followed by 2 orange flashes
2
Single band CO2 sensor module.
Followed by 3 orange flashes
3
Dual band CO2 sensor module
Followed by 4 orange flashes
4
VOC sensor module
Followed by 5 orange flashes
5
Motherboard
Followed by 6 orange flashes
6
Interconnection board
Followed by 7 orange flashes
7
Particle sensor board
Followed by 8 orange flashes
8
Power supply board
Red LED blinking
9
Multiple failures
Alternation Red Blue
10
Perishable sensor reaching the end
of life.
In the event of a multiple failures, the flashing of the LEDs does not identify the defective FRU, it is then
necessary to refer to the sent digital message.
4 Dismantling
4.1 Removing the front panel from the wall
Insert the flat part of a small screwdriver between the wall and the front panel (there are two spaces
below and two above for this purpose). Unclip the front panel using the screwdriver.
4.2 Flushed mount casing
If the FRU to be changed is in the casing (identifier> 1), the board must be removed from the casing:
Unscrew the two screws which connect the casing to the wall box.
Switch off the 24V supply to avoid any short circuit.
Disconnect the power by pushing with the screwdriver on the connector slots.
4.3 Opening the flushed mount casing
