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• Causes and corrections in instances when automatic address setting cannot be started.

The power LED on the outdoor unit control PCB does 
not turn ON.  

Check for any errors in the power wiring to the outdoor 
unit, and check for a missing phase.

LED 1 and 2 on the outdoor unit control PCB do not 
turn OFF when the outdoor unit power is turned ON, 
and automatic address setting cannot be started.

Check the “Alarm Displays” table and correct the 
problem.

An alarm appears immediately when automatic 
address setting is started from the remote controller.

Nothing happens when the operator attempts to start 
automatic address setting from the remote controller.

Check that the remote controller wiring and the inter-
unit control wiring are connected correctly.
Check that the indoor unit power is ON.

• Causes and corrections in instances when automatic address setting starts, but cannot be completed successfully.

An alarm appears on the remote controller sometime 
from several seconds to several minutes after 
automatic address setting is started.

Check the “Alarm Displays” table and correct the 
problem.

LED 1 and 2 on the outdoor unit control PCB indicate 
that automatic address setting is in progress (the LEDs 
blink alternately) for several minutes after automatic 
address setting is started (the compressors may also 
start and stop several times), however LED 1 and 
2 never indicate that automatic address setting is 
completed (turn OFF).

Check the alarm details on the “Outdoor Unit Control 
PCB LED 1 and 2 Alarms” table, then check the “Alarm 
Displays” table and correct the problem.

• If alarm E15, E16, or E20 appears after automatic address setting is started, check the following items.

 E15  

The number of indoor units detected during automatic address setting was smaller than the 
number of indoor units which was set with switch S004 on the outdoor unit PCB.  

 E16  

The number of indoor units detected during automatic address setting was larger than the 
number of indoor units which was set with switch S004 on the outdoor unit PCB.  

 E20  

The outdoor unit received no serial signals from indoor units within 90 seconds after 
automatic address setting was started.  

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Check that the indoor unit power is turned ON.

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Check that the inter-unit control wiring is connected correctly. (Check that there are no open 
circuits, short circuits, terminal plugs, incorrect wiring to the remote controller terminals, or 
similar problems.)

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Check that the remote controller wiring is connected correctly. (Check that there are no open 
circuits, short circuits, incorrect wiring to the inter-unit control wiring terminals, group control 
communication wiring, or similar problems.)

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Check that the number of indoor units has been set correctly using switch S004 on the 
outdoor unit control PCB.

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Check that the amount of additional refrigerant charge is correct (if automatic address setting 
is performed with the compressors ON).

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Check that the refrigerant tubing connections are correct (if automatic address setting is 
performed with the compressors ON).

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Check that there are no problems with indoor unit sensors E1 and E3 (if automatic address 
setting is performed with the compressors ON).

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Check that there are no indoor units where the system address was already incorrectly set by 
manual or automatic address setting.

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•  When automatic address setting is started from the outdoor unit control PCB or from the remote controller, 

 (SETTING) appears on the remote controller at units where the inter-unit control wiring and remote 

controller wiring are connected correctly. LED 1 and 2 on the outdoor unit control PCB blink alternately.

•  In the case of indoor unit group control, if there is a mistake in the remote controller communication wiring, 

addresses may not be set even if 

 (SETTING) appears.

•  Even if alarm E15 or E16 appears, addresses are set at those indoor units which could be verifi ed. The set 

addresses can be checked using the remote controller.

•  If one of the below alarms appears when the remote controller is operated after automatic address setting was 

completed (LED 1 and 2 on the outdoor unit control PCB are turned OFF), follow the instructions in the table 
below and correct the problem location.

Nothing is 

displayed.  

The remote controller is not connected correctly (power trouble).
The indoor unit power was cut off after automatic address setting was completed.

E01  

The remote controller is not connected correctly (remote controller receiving trouble).
The remote controller of an indoor unit where the indoor unit address is not set is inadvertently
operated. (Communications with the outdoor unit are not possible.)

E02  

The remote controller is not connected correctly (trouble with sending of the signal from the 
remote controller to the indoor unit).

E09  

The indoor unit ceiling panel connector is not connected correctly.

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The outdoor unit maintenance remote controller can be used to check the alarm display.
The number of times that LED 1 and 2 blink on the outdoor unit control PCB can be used to check the alarm 
display. (Refer to “Checking the LED 1 and 2 Alarm Display on the Outdoor Unit Control PCB.”)

•

E01

E02

E03

E04

E05

E06

Error in the Outdoor Unit Receiving Signal from the Indoor Unit

Error in Indoor Unit Transmitting Signal to the Outdoor Unit

Error in Indoor Unit Receiving Signal from the Outdoor unit

Error in Indoor Unit Receiving Signal from Remote Controller (central)

Remote Controller Transmission Error

Remote Controller Reception Error

E07

E08

E09

E12

E13

E15

Auto-Address Alarm (not enough units)

Error in Indoor Unit Transmitting Signal to Remote Controller

Start of Auto Address Setting Prohibited Due to Auto Address Setting Being in Progress

More Than One Remote Controller Set to Main Error

E16

E18

E20

E30

Outdoor Unit Serial Transmission Error

No Indoor Units Error

Faulty Communication in Group Control Wiring

Auto-Address Alarm (too many units)

F04

F07

Heat Exchanger Inlet Temperature Sensor (C1) Error

Compressor Discharge Temperature Sensor Error

F08

F12

F16

F31

Outdoor Unit Nonvolatile Memory (EEPROM) Error

High Pressure Sensor Error

Compressor Intake Temperature Sensor (TS) Error

Outdoor Air Temperature Sensor (TO) Error

H01

H02

H03

H31

HIC Error

Compressor CT Sensor (Current Sensor) Unplugged

L04

L10

Outdoor Unit Capacity Not Yet Setup Error

L18

4-way valve operation failure

Duplicated Setting of Outdoor System Address Error

PAM Error

Primary Current (Input) Detect of Overcurrent

Duplicate Indoor Unit Address Settings Error

Error in Outdoor Unit Transmitting Signal to the Indoor Unit

P03

P04

P05

P13

P14

P16

Overcurrent of Inverter Compressor

O

2

 Sensor

Forgot-to-open Valve Alarm

Power Supply Error

Actuation of High Pressure Switch

Compressor Discharge Temperature Error

P22

P29

INV Compressor Start-up Failed (including lock) Due to INV Compressor Wiring Open Phase, Faulty DCCT, etc.

Outdoor Fan Motor Error

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