Wall Mounted: 9RL2, 9RLS3, 9RLS3H, 9RLS3Y, 12RL2, 12RLS3, 12RLS3H, 12RLS3Y, 15RLS3, 15RLS3H, 15RLS3Y, 18RLB, 24RLB, 30RLXB, 30RLXEH, 36RLXB
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
8 Times Continuous
18
External communication
error
External Communication Error – After receiving a signal from the external I/O PCB, the same signal has not
been received for 15 seconds.
-Check any loose or removed connections between the controller PCB to the external I/O PCB, open cable or
mis-wiring.
-Replace controller PCB.
2 Times
3 Times Continuous
23
Combination error
Combination Error – The outdoor unit received a signal that the applied indoor unit is that of a multi type.
-Replace indoor unit with correct matching indoor unit.
2 Times
6 Times Continuous
26
Address setting error in
wired remote controller
system
Address Setting Error in Wired Remote Controller System – When the address number set by auto setting &
manual setting are mixed in on RC group. When the duplicated address number exists in one RC group.
-Check for wrong wiring connection in the RC group. (Refer to Installation Manual)
-Wrong RC group setting; the given address number by auto setting (00) and the manual set number (except
00) were not existing in one RC group, the remote controller address setting by U.I. was not an existing same
address, duplicated address number is not existing in one RC group.
-Check indoor unit controller PCB; check if the controller PCB is damaged.
2 Times
9 Times Continuous
29
Connection unit number
error
Combination Unit Number Error – When the number of connecting indoor units are out of a specified rule.
-Check wire installation; wrong number of connecting indoor unit.
-Check indoor unit controller PCB; check if controller PCB is damaged, check for error after setting remote
controller address.
3 Times
2 Times Continuous
32
Indoor unit model informa-
tion 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.
