Multi-Zones: ASU7RLF1, ASU9RLF1, ASU12RLF1, ASU18RLF, ASU15RLS, ASU15RLS2, ASU15RLF1, ASU24RLF, ARU7RLF, ARU9RLF, ARU12RLF, ARU18RLF, ARU24RLF,
AUU7RLF, AUU9RLF, AUU12RLF, AUU18RLF, AGU9RLF, AGU12RLF, AGU15RLF
Error Indication Wired
Remote
Controller
Error Diagnosis Method
Operation Timer Economy
1 Time 1 Time Continuous 11 Serial communication error
Communication Error – At Start Up, evaporator and condenser are not communicating.
-Check wiring from panel to condenser, condenser to evaporator. Wire nuts and splices are not recommended.
Check for correct voltages at panel, condenser and evaporator. Refer to the Service Instruction manual – Serial
Signal troubleshooting for further details.
1 Time 2 Times Continuous 12
Wired remote controller
communication error
Wired Remote Controller Communication Error – When the indoor unit cannot receive the signal from the
Wired Remote Control for more than 1 minute during normal operation.
-Check the connection of terminal between remote control and indoor unit and check if there is a
disconnection of the cable.
1 Time 5 Times Continuous 15 Check run unnished
Check-Run Unnished – When the operation command is inputted by the remote controller without check
operation completion.
-Check indoor unit number connection.
-Power down all indoors units with remote controller, reset disconnect and branch box power for 5 minutes,
reinitiate check-run operation.
2 Times 1 Time Continuous 21 Number of wires and pipes error
Number of Wires and Pipes Error – When the operation command is inputted by the remote controller without
check operation completion.
-Check indoor unit connection. -Check for crossed wiring or piping.
2 Times 2 Times Continuous 22 Indoor unit capacity error
Indoor Unit Capacity Error – The total capacity of the indoor units has been exceeded or is under the minimum
acceptable range.
-Check total capacity of the connected indoor units. -Check all eld wiring to ensure no breaks.
2 Times 3 Times Continuous 23 Connected combination error
Connected Combination Error – When power is on and one of the below occurs:
• When the wiring is incorrect.
• When the connection of an unsupported multi-zone condenser is installed.
2 Times 4 Times Continuous 24
Number of indoor units’ error /
Number of branch boxes error
Number of Indoor Units Error / Number of Branch Boxes Error – When the total connection number of indoor
units is outside of range between 2 and 8. / When the number of branch boxes 1 and 2 are different and the
operation command is input to the outdoor unit.
-Check indoor unit number connection for overcapacity.
-Check power to the branch boxes.
3 Times 2 Times Continuous 32
Indoor unit model information
error
EEPROM access abnormal
EEPROM Error – Electronically Erasable and Programmable Read Only Memory. It is a non-volatile memory
which keeps memorized information even if power is turned off. It can change the contents electronically. To
change the contents, it uses higher voltage than normal and cannot change partial contents. Rewriting shall
be done upon erasing all the contents. There is a limit in several rewritings.
-Check if the ground connection is proper. Check if there is any equipment that causes harmonic wave near the
power cables, i.e. neon light bulb.
3 Times 5 Times Continuous 35 Manual auto switch error
Manual Auto Switch Error – When the Manual Auto Switch becomes on for 60 or more consecutive seconds.
-Check if Manual Auto switch is kept pressed. Check On/Off switching operation by using a meter.
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