Test Run
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7. Meaning of Alarm Messages
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
z
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.
Indoor unit communication error
of group control wiring.
Alarm
<E01>
<E02>
<E06>
<<E03>>
E04
E08
<<E09>>
E12
E15
E16
E20
E24
E25
E26
E29
E18
<L03>
L04
L05
L06
L07
L08
<<L09>>
L17
Error of outdoor unit address setting.
Main outdoor unit is detecting error signal from sub outdoor unit.
L02
L10
Possible cause of malfunction
Serial
communication
errors
Mis-setting
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”.)
Improper setting.
Mis-match connection of outdoor units that have different kinds of
refrigerant.
Capacity code of indoor unit is not set.
Capacity code of outdoor unit is not set.
Indoor unit address is not set.
Group control wiring is connected to individual control indoor unit.
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
Duplication of outdoor R.C. address setting.
This alarm message shows when an indoor unit for multiple-use
is not connected to the outdoor unit.
The number of connected main and sub outdoor units do not
correspond to the number set at main outdoor unit PCB.
Error of main indoor unit in receiving serial communication signal
from sub indoor units.
Error of sub outdoor unit in receiving serial communication signal
from main outdoor unit.
No indoor unit is connected during auto. address setting.
Error in auto. address setting. (Number of connected indoor units
is more than the number set.)
Error in auto. address setting. (Number of connected indoor units
is less than the number set.)
Starting auto. address setting is prohibited.
This alarm message shows that the auto address connector CN100
is shorted while other RC line is executing auto address operation.
Remote control address connector (RCU. ADR) is duplicated.
(Duplication of main remote controller)
Indoor unit address setting is duplicated.
Error of the main outdoor unit in receiving serial communication
signal from the indoor unit.
Error in receiving 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.
Indoor unit is detecting error signal from remote controller (and system controller).
Error in receiving serial communication signal.
When turning on the power supply, the number of connected
indoor units does not correspond to the number set. (Except R.C.
address is “0”.)
Duplication of main indoor unit address setting in group control.
Continued
message
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)
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Summary of Contents for U-72MF1U9
Page 118: ...Section 8 TENTATIVE ...