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8-7. Meaning of Alarm Messages
Table of Self-Diagnostics Functions and Description of Alarm Displays
Alarm messages are indicated by the blinking of LED 1 and 2 (D72, D75) on the outdoor unit PCB. They are also displayed on
the wired remote controller.
● Viewing the LED 1 and 2 (D72 and D75) alarm displays
Possible cause of malfunction
Remote controller is detecting
error signal from indoor unit.
Indoor unit is detecting error
signal from main outdoor unit.
Improper setting of indoor unit or
remote controller.
During auto address setting,
number of connected units does
not correspond to number set.
When turning on the power
supply, number of connected
units does
not correspond to
number set.
(Except R.C. address is “0.”)
Indoor unit communication error
of group control wiring.
Improper setting.
Alarm
message
<E01>
<E02>
<E06>
<<E03>>
E04
E08
<<E09>>
E12
E15
E16
E20
E24
E25
E26
E29
E18
<L03>
L04
L05
L06
L07
L08
<<L09>>
L17
Indoor unit is detecting error signal from remote controller (and system controller).
Error in receivi
ng serial communication signal.
(Signal from main indoor unit in case of group control)
Ex: Auto address is not completed.
Error in transmitting serial communication signal.
Error in receiving serial communication signal.
When turning on the power supply, the number of connected
indoor units does n
ot correspond to the number set. (Except R.C.
address is “0.”)
Indoor unit address setting is duplicated.
Remote controller address connector (RCU. ADR) is duplicated.
(Duplication of main remote controller)
Starting auto address setting is prohibited.
Error in auto address setting. (Number of connected indoor units
is less than the number set.)
Error in auto address
setting. (Number of connected indoor units
is more than the number set.)
Error of outdoor unit address setting.
The number of connected main and sub outdoor units do not
correspond to the number set at main outdoor unit PCB.
Error of sub outdoor unit in receiving serial communication signal
from main outdoor unit.
Error of main indoor un
it in receiving serial communication signal
from sub indoor units.
Duplication of main indoor unit address setting in group control.
Duplication of outdoor R.C. address setting.
Group control wiring is connected to individual control indoor unit.
Indoor unit address is not set.
Capacity code of indoor unit is not set.
There are 2 or more indoor unit
controllers that have operation
mode priority in refrigerant circuit.
Priority set remote
controller
Non-priority set remote
controller
Error of the main outdoor unit in receiving serial communication
signal from the indoor unit.
This alarm message shows that the auto address connector CN100
is shorted while other RC line is executing auto address operation.
No indoor unit is connected during auto address setting.
Main outdoor unit is detecting error signal from sub outdoor unit.
Mis-matched connection of outdoor units that have different kinds
of refrigerant.
Serial
communication
errors
Mis-setting
Continued
This alarm message shows when an indoor unit for multiple-use
is not connected to the outdoor unit.
Capacity code of outdoor unit is not set.
L02
L10
L18
4-way valve operation failure
LED 1
LED 2
Alarm contents
Alternating
Alarm display
LED 1 blinks M times, then LED 2 blinks N times. The cycle then repeats.
M = 2: P alarm 3: H alarm 4: E alarm 5: F alarm 6: L alarm
N = Alarm No.
Example: LED 1 blinks 2 times, then LED 2 blinks 17 times. The cycle then repeats.
Alarm is "P17."
( : Blinking)
Connect the outdoor maintenance remote controller to the RC socket on the outdoor main unit control PCB (3P, b l ue),
and check the Alarm Messages on the remote controller display.
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