Toshiba air error codes

To find out what’s going on with your air conditioner, check the error code on the block display, remote controller or center unit 7-segment display. Can you notice any strange letters or numbers? If yes, you’re lucky as the error codes can be a key to the issue the air conditioner is experiencing. The tables below provide explanations for the error codes for air conditioners made by the Japanese multinational corporation Toshiba.

Toshiba RAS-07UKH air error codes

BLOCK DISPLAYCHECK CODESELF-DIAGNOSISCHECK CODE
AOperation Display Flashing (1 Hz)-Power Failure (When power is on)-
BOperation Display Flashing (5 Hz)OOThermo Sensor (TA) Short/Break0C
COperation Display Flashing (5 Hz)O1Heat Exchanger Sensor (TC) Short/Break0D
DOperation Display Flashing (5 Hz)OOIndoor Fan Lock, Abnormality of Indoor Fan, IC03 Short/Break11
EOperation and Timer Display Flashing (5 Hz)O1Thermal Fuse is Blown (Indoor Fan Motor is overheat)O4

Toshiba Super MMU-AP0091H air error codes

Check code displayed on remote controllerCenter unit 7-segment displayCauseCountermeasures
E04E19-00Outdoor 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.
LOSAddress setup errorSet 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-XXDuplication of indoor addresses.Set up address again.
CA7There 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.
E06After 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.
E16E16-XXExceeded No of connected indoor units or exceeded capacity.Adjust No of connected indoor units or capacity.
E25E25Duplication of outdoor addresses.Do not use a manual setup for outdoor address.
E26E26-XXNo. 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.
L04L04Duplication of outdoor line addresses • Line address setup error, occurred after connection between Ui. Lb and lb, U4 connectorsModify line address setup of the header unit between lines. (Set up SW 13 and 14 on the interface P.C. board.)
L05OL06Duplicated of indoor units with prioritySet up priority to only one indoor unit.
L06There are two or more indoor units set up with priority.
L08LOSAddress setup errorSet up address again.
• Only indoor addresses of all the connected indoor units are undefined.
Back to Top