We reserve the right to make changes without prior notice
95
CODE
DESCRIPTION
MAIN CAUSE POTENTIAL
RESOLUTION OF THE PROBLEM
RESET
UNIT
OFF
DEVICES
SWITCHED
OFF
AL03
High pressure
in circuit 1
A high pressure alarm has triggered in
refrigerant circuit 1 generated by the
high pressure switch.
Check the operating conditions.
Check the condensing pressure.
Check the refrigerant level.
Check the condensation fans.
Manually reset the high pressure switch
before resetting the alarm on the display.
Check for correct operation of the high
pressure switch.
M No
All
compressors in
circuit 1
AL04
High pressure
in circuit 2
A high pressure alarm has triggered in
refrigerant circuit 2 generated by the
high pressure switch.
Check the operating conditions.
Check the condensing pressure.
Check the refrigerant level.
Check the condensation fans.
Manually reset the high pressure switch
before resetting the alarm on the display.
Check for correct operation of the high
pressure switch.
M No
All
compressors in
circuit 2
AL05
Antifreeze alarm
Digital input 1 opens.
Check the operating conditions.
A (3)
No
Compressors -
summer mode
only
AL06
The high
temperature
threshold was
exceeded.
The ambient temperature exceeds the
max. setpoint limit.
Check the operating conditions.
A
No None
AL07
The low
temperature
threshold was
exceeded.
The ambient temperature is below the
min. setpoint limit.
Check the operating conditions.
A (3)
No None
AL08
Low pressure in
circ. 1 - summer
mode
A low pressure alarm has triggered in
refrigerant circuit 1 - summer mode -
generated by the low pressure switch.
Check the operating conditions.
Check the evaporation pressure.
Check the refrigerant level.
Check the evaporation fans.
Check for correct operation of the low
pressure switch.
M No
All
compressors in
circuit 1
AL09
Low pressure in
circ. 2 - summer
mode
A low pressure alarm has triggered in
refrigerant circuit 2 - summer mode -
generated by the low pressure switch.
Check the operating conditions.
Check the evaporation pressure.
Check the refrigerant level.
Check the evaporation fans.
Check for correct operation of the low
pressure switch.
M No
All
compressors in
circuit 2
AL10
Low pressure in
circ. 1 - winter mode
A low pressure alarm has triggered in
refrigerant circuit 1 - winter mode -
generated by the low pressure switch.
Check the operating conditions.
Check the evaporation pressure.
Check the refrigerant level.
Check the evaporation fans.
Check for correct operation of the low
pressure switch.
M No
All
compressors in
circuit 1
AL11
Low pressure in
circ. 2 - winter mode
A low pressure alarm has triggered in
refrigerant circuit 2 - winter mode -
generated by the low pressure switch.
Check the operating conditions.
Check the evaporation pressure.
Check the refrigerant level.
Check the evaporation fans.
Check for correct operation of the low
pressure switch.
M No
All
compressors in
circuit 2
AL12
Compressor 1
maintenance
The threshold relating to the hours of
operation of compressor 1 has been
exceeded.
Check for compressor operation.
M (1)
No None
AL13
Compressor 2
maintenance
The threshold relating to the hours of
operation of compressor 2 has been
exceeded.
Check for compressor operation.
M (1)
No None
AL14 Unit
maintenance
The threshold relating to the hours of
operation of the unit has been
exceeded.
Check the unit and perform routine
maintenance.
M (1)
No None
AL15
Main fan thermal
overload
switch/interlock
A thermal overload switch has tripped in
one of the main fans (air delivery).
Check the operating conditions.
Check the motor wiring and the power
absorption.
Check the electric motor fitted in the fan.
Check the thermal overload switch.
M Yes
All
AL16
Dirty filter
The dirty filer pressure switch has
tripped: this indicates a greater head
loss in the air filters than the stored
threshold.
Clean or replace the air filters.
Check the dirty filter pressure switch for
correct calibration and operation.
M No
None