D-EOMOAH00903-21_01EN 25 / 37
Alarm String
Description
Possible causes & solutions
Supply #
filter Fault
# = 1,2,3,4
Supply # filter Fault. Filter
dirty.
Filter is dirty, the fault is
notified in the HMI, unit is
stopped.
It occurs when the measured
differential pressure is
greater than the fault
threshold set in
Commissioning
→
AHU
Configuration
→
Config
Functions submenu.
The filter is dirty
Change the filter
Return #
filter Fault
# = 1,2
Return # filter Fault. Filter
dirty.
Filter is dirty, the fault is
notified in the HMI, unit is
stopped.
It occurs when the measured
differential pressure is
greater than the fault
threshold set in
Commissioning
→
AHU
Configuration
→
Config
Functions submenu.
Causes
Solutions
The filter is dirty
Change the filter
Cooling DX:
Alarm
This alarm occurs when the
alarm signal from the external
condensing unit is active
Causes
Solutions
The alarm signal of the
condensing unit is not
connected to the controller
Check the wiring connection
between the input “DX Coil step #1
(#2, or #3) Alarm” of the controller
and alarm output of the condensing
unit
The condensing unit is in a
fault state
- Refer to troubleshooting of the
condensing unit
- Check the electrical connection of
the condensing unit
Supply fan:
Alarm
Differential pressure error of
the supply fan active or fan
overload.
This alarm occurs when the
differential pressure of the
supply fan is too high before
and after the supply fan or if
the fan is in overload.
Causes
Solutions
The differential pressure
transducer is broken.
Replace transducer
The belt is broken
Change the belt
The pressure switch is
broken
Replace the pressure switch
The fan is broken
Replace the fan
The fan is in overload
Refer to the troubleshooting of the
fan
