710.1760.00.04-05 22/05/2014
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Wait at least 15 minutes before removing the protective panels so that the chiller can cool
down. Certain internal components have a very high and dangerous operating temperature!
Never open the sealed cooling assembly (compressor, evaporator and condenser) if there may
be any refrigerant or lubricating oil present!
Never carry out any welding or soldering on the cooling system when it contains refrigerant in order to
avoid the risk of generating toxic substances.
9.1 POSSIBLE ALARM SIGNALS AND THEIR RECTIFICATION
CONTROLLER TYPE “D” (CHW 11 TO CHW 36; CHG 08)
No. Device
status
Alarm
code
Alarm de-
scription
Possible cause Recommended remedy Fault
rectification (*)
1
Pump is
working,
fan and
compressor
are not
working
/
Refrigerant
high pressure
alarm
Ambient temperature too
high
Decrease ambient tempera-
ture, increasing ventilation of
the room, removing heat
sources or repairing the unit
from the direct rays of sun
M after reset
high pressure
switch using but-
ton on it if pre-
sent
Dirty condenser
Clean the condenser as de-
scribed in maintenance
Fan is not working fine or
the sense of rotation is not
correct
Check fuse of the fan, and
right rotation
Required cooling capacity is
higher than nominal
Decrease the required cooling
capacity
Air filter dirty (only for units
with this kind of option)
Dismount the filter from the
unit and clean it with air or
with water
OFF
Unit is in Off by
remote ON/OFF
Remote ON/OFF contact is
open or internal bridge re-
moved
Check bridge ROO and close
the contact
A
OFF Unit in stand by
The unit is energized but not
switched on
Follow procedure to start up
the unit using button on
controller
LA2
Anti-freeze
alarm
Percentage of antifreeze too
low
Add antifreeze to the liquid
Set point is too low for actu-
al system
If possible increase set point,
or check combination of flow,
temperature and antifreeze
percentage
Liquid flow too low
Check right rotation of pump
and possible obstruction on
liquid circuit
Dirty evaporator
Clean evaporator and in case
contact service
P1
Sensor SL de-
fective
Probe can be defective or
not well connected
Check connection and in case
change probe
HA
High liquid
temperature
alarm
Compressor switched off by
internal protection
Contact a technician
2
Pump is not
working,
fan and
compressor
are working
Pump is
blocked
The gear of the pump is
blocked by dusty or corro-
sion
Try to move the axe of the
pump and after that switch on
again
A
The motor of the pump is
internally protected
Switch off the unit for one hour
and try again after check the
axe is not blocked and there
are no liquid obstruction
3
Pump, fan
and
compressor
are not
working
LA2
Anti-freeze
alarm
Liquid flow too low Check no. 2 for pump problem
A
CA
Unit is in Off by
remote ON/OFF
Remote ON/OFF contact is
closed
Check bridge ROO and open
the contact
digital input
alarm
Liquid flow too low
Check right rotation of the
pump and possible obstruction
on liquid circuit
Liquid in the tank too low Fill the tank
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