Alarm Descriptions
Table 22: Troubleshooting System Alarms
If the alarm is
triggered once or
twice in an hour, it is
reset automatically.
If it occurs three
times in an hour, the
compressor and
condenser fan are
locked.
Run the unit and check if
the low pressure value is
in the normal range.
Reset manually using the
L04 menu, U2L
parameter, or restart the unit
to remove the alarm.
Charge appropriate amount
of refrigerant.
Check if the low pressure
switch is OK.
If it is defective, replace it.
Check if the connection
to the corresponding
input terminal (ID3) is ok
or if the controller board
is defective.
Check if the connection is
OK.
Check if the controller
board is OK.
Reconnect the cables.
If the controller board is
defective, replace it.
If the alarm is
triggered once or
twice in an hour, it
can be reset
automatically.
If it occurs three
times in an hour, the
compressor and
condenser fan are
locked.
Reduced condenser
heat exchange
Run the unit and check if
the high pressure value is
in the normal range.
Reset manually using the
L04 menu U2E
parameter or restart the unit
to remove the alarm.
Discharge appropriate
amount of the refrigerant.
Clean the condenser.
Condenser fan has
failed.
The condenser fan
speed controller has
failed.
Check the condenser fan
status while the high
pressure is outside the
normal setting.
Replace the condenser fan.
Replace the condenser fan
speed controller.
Check if the high
pressure switch is OK.
If it is defective, replace it.
Check if the connection
to the corresponding
input terminal (ID4) is ok
or if the controller board
is defective.
Check if the connection is
OK.
Check if the controller
board is OK.
Reconnect the cables.
If the controller board is
defective, replace it.
The entire unit stops
working. The alarm
resets automatically.
Fire/Smoke detector is
triggered.
Check the external
Fire/Smoke detector
WPU 1.
Replace the external
Fire/Smoke detector
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