Panasonic U-72MF1U9 Installation Instructions Manual page 50

7-7. 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
LED 1 LED 2
Alarm display
LED 1 blinks M times, then LED 2 blinks N times. The cycle then repeats.
Alternating
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.
( : Blinking)
Possible cause of malfunction
Serial Remote controller is detecting
communication error signal from indoor unit.
errors
Mis-setting
Indoor unit is detecting error signal from remote controller (and system controller).
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 contents
Alarm is "P17".
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.
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".)
Error of the main outdoor unit in receiving serial communication signal
from the indoor unit.
Indoor unit address setting is duplicated.
Remote control address connector (RCU. ADR) is duplicated.
(Duplication of main remote controller)
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.
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.)
No indoor unit is connected during auto. address setting.
Main outdoor unit is detecting error signal from sub outdoor unit.
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 unit in receiving serial communication signal from
sub indoor units.
This alarm message shows when an indoor unit for multiple-use
is not connected to the outdoor unit.
Duplication of main indoor unit address setting in group control.
Duplication of outdoor R.C. address setting.
There are 2 or more indoor unit
controllers that have operation mode
priority in refrigerant circuit.
Group control wiring is connected to individual control indoor unit.
Indoor unit address is not set.
Capacity code of indoor unit is not set.
Capacity code of outdoor unit is not set.
Mis-match connection of outdoor units that have different kinds of
refrigerant.
50
Priority set remote controller
Non-priority set remote controller
Continued
Alarm
message
<E01>
<E02>
<<E03>>
E04
<E06>
E08
<<E09>>
E12
E15
E16
E20
E24
E25
E26
E29
E18
L02
<L03>
L04
L05
L06
L07
L08
<<L09>>
L10
L17