710.1760.00.04-05 22/05/2014
36
CONTROLLER TYPE “C” (CHW 682 TO CHW 3652; CHG 225 TO CHG 365)
No.
Device
status
Alarm
code
Alarm description Possible cause Recommended remedy Restore (*)
1
Pump, fan
and com-
pressor are
not working
OFF
Unit is in Off by re-
mote ON/OFF
Remote ON/OFF contact is
open or internal bridge
removed
Check bridge ROO and close
the contact
A
Led off Unit in stand by
The unit is energized but
not switched on
Follow procedure to start up
the unit using button on
controller
A
ACF1
……..
ACF9
Configuration alarm
Parameters set up in a
wrong way
Check parameter setup A
AEFL Flow switch alarm
Liquid flow too low
Check right rotation of the
pump and possible obstruction
on liquid circuit
A
becomes
M after 1
events in 1
hour
Liquid in the tank too low Fill the tank
AEE Eeprom run
Internal problem of the
controller
Reset alarm and in case of
persistent problem change
controller
M
AFR Frequency alarm
The frequency of power
supply is out of range
Check correct power supply A
ALOC
ALC1
Unit is stopped by
remote contact
Remote contact is open or
internal bridge removed
Check bridge IAE and close the
contact
A
ATE1
ATE2
Pump thermal
switches alarm
Thermal protections of a
new unit are in OFF posi-
tion
Switch MTP in ON
M after reset
MTP
Pump is having problem
Reset thermal switch and in
case contact of a persistent
problem contact service
2
Fans and
compres-
sors are
not work-
ing, pump
is working.
AEHT
High liquid tempera-
ture alarm (if P3 or
P4 high temp. alarm
is present)
Required cooling capacity
is higher than nominal
Decrease the required cooling
capacity
A
becomes
M after 3
events in 1
hour
B1HP
B2HP or
C1HP
……..
C6HP
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
button on it if
present
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 op-
tion)
Dismount the filter from the
unit and clean it with air or
with water
B1PH
B2PH
Pump down alarm
stops control circuit.
The pumping off operation
has exceeded the time lim-
it.
contact service.
A
becomes
M after 3
events in 1
hour
B1LP
B2LP
Refrigerant low pres-
sure alarm
Unit low on refrigerant
Check liquid sight glass and in
case contact service
A
becomes
M after 10
events in 1
hour
Liquid flow too low
Check right rotation of pump
and possible obstruction on
liquid circuit
Percentage of antifreeze
too low or not present,
even for range of tempera-
ture higher than 5°C
Add antifreeze, or try to in-
crease temperature or flow of
liquid the combination of these
three element can cause ice
problem
Dirty evaporator
Clean evaporator and in case
contact service
B1AC
B2AC
Antifreeze alarm
Percentage of antifreeze
too low
Add antifreeze to the liquid
M
Set point is too low for ac-
tual system
If possible increase set point,
or check combination of flow,
temperature and antifreeze
percentage
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