Code Category Content of abnormality Possible cause
21
Outdoor unit
sensor
High pressure sensor
Incorrect wiring, disconnected wiring, broken cable, short
circuit.
22 Outdoor air thermistor
23 Discharge gas thermistor at top of compressor
24 Heat exchanger liquid pipe thermistor
25 Heat exchanger gas pipe thermistor
29 Low pressure sensor
31
System
Incorrect capacity setting on outdoor and indoor units
Combination capacity incorrectly set. Excessive or insufficient
total indoor unit capacity.
35 Indoor unit no. incorrectly set Indoor unit no. duplicated in same reference group.
38
Abnormality in the collection circuit for outdoor unit
protection
Protection detection device fault (incorrect wiring of outdoor
PCB).
39 Compressor
Abnormal operation current in constant speed
compressor
Overcurrent, blown fuse, current sensor fault, instant power
failure, voltage drop, abnormal power supply.
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 activation
Defective compression (compressor or inverter fault, loose
power supply connection).
44 Low-pressure increase protection device activation
Overload during cooling, high temperature with heating, locked
expansion valve (loose connector).
45 High pressure increase protection device activation
Overload (clogging, short pitch), pipe clogging, excess
refrigerant, mixture of inert gas.
47
Low-pressure decrease protection device activation
(vacuum protection)
Insufficient refrigerant, refrigerant pipes, clogging, expansion
valve locked in open position (loose connector).
48 Inverter overcurrent protection device activation Overload, compressor fault.
51 Sensor Abnormal inverter current sensor Current sensor fault.
53
Inverter
Inverter error signal detection
Controller IC error signal detection (overcurrent, low-voltage
and short-circuit protection).
54 Abnormal inverter fin temperature
Abnormal inverter fin thermistor, heat exchanger clogging, 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 fin 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 fin
temperature, low voltage, earthing fault,
step-out).
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.
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 refrigerant 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.
8 Troubleshooting
169
SMGB0065 rev. 1 - 12/2010
8
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