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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

F06

F07

Heat Exchanger Inlet Temperature Sensor (C1) Error

Outdoor Air Intake Temperature Sensor 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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8 - 1

1. General .............................................................................................................................. 8-2
2. Basic Points for Using Existing Tubing ............................................................................... 8-2
3. VRF Renewal Kit with High-pressure SW Kit and Sight Glass  ......................................... 8-3
4. Procedure for Renewal ...................................................................................................... 8-4
5. Judging Whether Possible to Reuse Existing Tubing: Judgments 1 to 5 ........................... 8-5
6. Heating Test Run and Cooling Test Run ............................................................................ 8-9

1. Purposes for Attaching VRF Renewal Kit ........................................................................ 8-10
2. Type of oil......................................................................................................................... 8-10
3. Oil discoloration ............................................................................................................... 8-10
4. Oil color standards for renewal ........................................................................................ 8-11
5. Standards for judging refrigerant with sight glass ............................................................ 8-11

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8 - 2

VRF 

*1

 adopts the refrigerant R410A that has a higher pressure than conventional refrigerants, but it uses high-

precision microcomputer control to enable operation at a "design pressure of 3.3 MPa," which is around the same 
as that before the refrigerant R410A was adopted. This means that you can use refrigerant tubing for R22 

*2

.

Furthermore, if certain conditions are satisfi ed, you can reuse existing tubing by attaching one VRF Renewal Kit
(CZ-SLK2) to each outdoor unit.
When performing the work, check the "DESIGN of VRF SYSTEM" section together with this section.

*1.  Systems for 2WAY VRF (ME1E81 series: only 8HP ~ 16HP), MINI VRF and 3WAY VRF.
*2.  Refrigerant tubing R22 has a maximum working pressure of 3.45 MPa and can be used for refrigerants such as 

R22 and R407C.

For existing tubing to be reused, the condition of the tubing needs to satisfy the basic points of "Safety" and
"Cleanliness". First, confi rm that the condition of the existing tubing satisfi es the following check items.

 Safety

• The existing unit shall be an air conditioner for use with R22/R407C/R410A refrigerant.

The reuse of existing tubing and the like that has been used for an application other than air conditioning 
(refrigerating device, etc.) is prohibited because it is diffi cult to know the situation.

• The tubing shall not be dented, cracked, corroded, etc.

Checking whether existing tubing is damaged, dented, and the like and the reliability of tubing strength is the 
responsibility of the installer performing the installation and is not guaranteed by us.

• The maximum working pressure of branches shall be 3.3 MPa or more. Furthermore, the branches shall be our 

genuine products.
We do not guarantee the tubing strength of any branch that is not a genuine product of us.

• The thermal insulation material shall not be decayed and peeling off.

If there is no thermal insulation installed on the liquid tubing, thermal insulation needs to be installed.

 Cleanliness

• The oil of the existing unit shall be any one of the following.

Mineral oil 

: Suniso, Freol S and MS

Synthetic fl uid : Alkyl benzene-type (HAB, Barrel-freeze), ester-type, ether-type (PVE only)

If the existing unit is GHP, cleaning of the tubing is required.

• The existing tubing shall be connected to the indoor unit and outdoor unit and be air tight.

Using tubing that is dirty inside as is may cause a failure of the new equipment.

• Trouble with foreign material contaminating the inside of the tubing shall not have occurred during the period

with which the existing unit was used (layer short in compressor, clogging caused by moisture freezing, oxide
scale, etc.). If such trouble has occurred, appropriate measures shall have been taken.
Using tubing that is dirty inside as is may cause a failure of the new equipment.

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