Code Category Content of abnormality Possible cause
3A
Outdoor unit
Abnormal outdoor unit capacity. Outdoor unit capacity >54 HP.
3b
Voltage or combination of outdoor unit models
incorrectly set
Voltage or combination of secondary and main units
incorrectly set.
3d
Abnormal transmission between the main unit
and the secondary unit(s)
Incorrect wiring, disconnected wiring, broken cable, PCB
fault.
43
Protection device
Low-pressure decrease protection device activa-
tion
Defective compression (compressor or inverter fault,
loose power supply connection).
44
Low-pressure increase protection device activa-
tion
Overload during cooling, high temperature with heating,
locked expansion valve (loose connector).
45
High pressure increase protection device activa-
tion
Overload (clogging, short pitch), pipe clogging, excess
refrigerant, mixture of inert gas.
47
Low-pressure decrease protection device activa-
tion (vacuum protection)
Insufcient refrigerant, refrigerant pipes, clogging, ex-
pansion valve locked in open position (loose connector).
48
Inverter overcurrent protection device activation Overload, compressor fault.
51
Inverter
Abnormal inverter current sensor Current sensor fault.
53
Inverter error signal detection
Controller IC error signal detection (overcurrent, low-
voltage and short-circuit protection).
54
Abnormal inverter n temperature
Abnormal inverter n thermistor, heat exchanger clog-
ging, fan motor fault.
55
Inverter fault Inverter PCB fault.
57
Fan controller
Fan controller protection activation
Controller IC error signal detection (overcurrent, low-
voltage and short-circuit protection), instant overcurrent.
5A
Abnormal fan controller n temperature
Fin thermistor fault, heat exchanger clogging, fan motor
fault.
5b
Overcurrent protection activation Fan motor fault.
5C
Abnormal fan controller sensor
Current sensor fault (instant overcurrent, increased n
temperature, low voltage, earthing fault, step-out).
b1
Outdoor unit
number setting
Unit number or address number of the outdoor
unit incorrectly set
A number greater than 64 has been set for the refriger-
ant cycle or address.
b5
Indoor unit number
setting
Connection number of the indoor unit incorrectly
set
There are more than 17 units not corresponding to H-
LINK II connected to one system.
C1
CH unit
Incorrect indoor unit connection
There are 2 or more CH units connected between the
outdoor and indoor units.
C2
Connection number of the indoor unit incorrectly
set
There are 9 or more indoor units connected to the CH
unit
C3
Incorrect indoor unit connection
Indoor units from different refrigerant cycles have been
connected to the CH unit.
EE Compressor
Compressor protection alarm (cannot be reset
from the remote controller)
This alarm code is displayed when the following alarms
are triggered three times within six hours: 02, 07, 08, 39,
43 to 45, 47.
72
PMML0294A rev.2 - 07/2014
Alarm codes
PMML0294A_rev.2_02-2014.indb 72 14/07/2014 12:28:40
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