D-EOMOAH00903-21_01EN - 24 / 37
Alarm String
Description
Possible causes & solutions
Heating Pump:
Alarm
Heating pump possible
malfunction.
This alarm occurs when the
water pump communicate to
the controller an alarm
condition.
The alarm signal of the
water pump is not
connected to the controller
Check the wiring connection
between the input “Cooling/Heating
coil pump alarm” (water coils
combined) or “Heating coil pump
alarm” (water coils separated or
only a heating water coil present)
of the controller and alarm output
of the pump
The pump is in a fault state
- Refer to troubleshooting of the
water pump
- Check the electrical connection of
the pump
- Replace the pump if broken
Cooling Pump:
Alarm
Cooling pump possible
malfunction.
This alarm occurs when the
water pump communicate to
the controller an alarm
condition.
Causes
Solutions
The alarm signal of the
water pump is not
connected to the controller
Check the wiring connection
between the
input “Cooling/Heating
coil pump alarm” of the controller
and alarm output of the pump
The pump is in a fault state
- Refer to troubleshooting of the
water pump
- Check the electrical connection of
the pump
- Replace the pump if broken
Supply #
filter Warning
# = 1,2,3,4
Supply # filter warning.
Filter is dirty, the warning is
notified in the HMI, but unit
can still run.
It occurs when the measured
differential pressure is
greater than the warning
threshold set in Setpoints
submenu.
Causes
Solutions
The filter is dirty
Plan to change the filter
Return #
filter Warning
# = 1,2
Return # filter warning.
Filter is dirty, the warning is
notified in the HMI, but unit
can still run.
It occurs when the measured
differential pressure is
greater than the warning
threshold set in Setpoints
submenu.
Causes
Solutions
The filter is dirty
Plan to change the filter
Causes
Solutions
