| Check code displayed on remote controller | Center unit 7-segment display | Cause | Countermeasures |
| E04 | E19-00 | Outdoor power is formerly turned on. | Turn on the power again. |
| | | (In order of Indoor -»Outdoor) |
| | There is none o( outdoor terminal resistance, or there are two or more resistances. | Check SW30 bit 2 of the header unit. |
| | | No connection between multiple refrigerant lines: SW30 bit 20N |
| | | Connection between multiple refrigerant lines: SW30 bit 2 of the connected header unit is turned |
| | | on only in one line. |
| | After address was decided, all the indoor units do not correctly response after power-ON in outdoor unit. | Check and modifies disconnection of indoor/outdoor communication line.(Communication line between center unit and the leading indoor unit) |
| | | Check influence of communication noise. |
| LOS | Address setup error | Set up address again. |
| | • Only line addresses of the connected indoor units are undefined. | |
| | • The outdoor line address and the line addresses in all indoor units do not match. | |
| | • The indoor addresses are duplicated. | |
| | • A header unit is not set up in a group. | |
| E08-XX | Duplication of indoor addresses. | Set up address again. |
| CA7 | There is none of outdoor terminal resistance, or there are two or more resistances. | Check SW30 bit 2 of the header unit. |
| | (After address setup, when terminal resistance setup is changed after power-ON.) | No connection between multiple refrigerant lines: SW30 bit 20N |
| fcU/ | | Connection between multiple refrigerant lines: SW30 bit 2 of the connected header unit is turned on only in one line. |
| | Transmission circuit error at interface side (P.C. board failure) | Replace the interface P.C. board. |
| E06 | After address setup, communication from all the indoor units interrupted under condition that a normal operation can be performed. | Check and correct disconnection of indoor/outdoor communication line.(Communication line between header unit and the leading indoor unit) |
| | | Check influence of communication noise. |
| E16 | E16-XX | Exceeded No of connected indoor units or exceeded capacity. | Adjust No of connected indoor units or capacity. |
| E25 | E25 | Duplication of outdoor addresses. | Do not use a manual setup for outdoor address. |
| E26 | E26-XX | No. of connected outdoor units decreased. | Correct of cause of error occurrence |
| | • When setting outdoor backup | • If it occurred when setting backup, dear the error after setup finish. |
| | • The power of follower unit is not turned on. | • If the power of follower unit is not turned on. turn on the power. |
| L04 | L04 | Duplication of outdoor line addresses • Line address setup error, occurred after connection between Ui. Lb and lb, U4 connectors | Modify line address setup of the header unit between lines. (Set up SW 13 and 14 on the interface P.C. board.) |
| L05O | L06 | Duplicated of indoor units with priority | Set up priority to only one indoor unit. |
| L06 | | There are two or more indoor units set up with priority. | |
| L08 | LOS | Address setup error | Set up address again. |
| | • Only indoor addresses of all the connected indoor units are undefined. | |
