Panasonic U-8ME1E8 Mode D'emploi page 28

SUPPLEMENT
7-6. Caution for Pump Down
Pump down means refrigerant gas in the system is returned
to the outdoor unit. Pump down is used when the unit is to be
moved, or before servicing the refrigerant circuit.
(Refer to the Service Manual)
● This outdoor unit cannot
collect more than the rated
CAUTION
refrigerant amount as
shown by the nameplate on
the back.
● If the amount of refrigerant
is more than that
recommended, do not
conduct pump down. In this
case use another refrigerant
collecting system.
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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 (D023, D024) on the outdoor unit PCB.
They are also displayed on the wired remote controller.
● Viewing the LED 1 and 2 (D023 and D024) 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.
Alarm is "P17."
( : Blinking) Connect the outdoor maintenance remote controller to the RC socket on the outdoor main unit control PCB (3P, blue),
and check the Alarm Messages on the remote controller display.
Possible cause of malfunction
Serial Remote controller is detecting Error in receiving serial communication signal.
communication error signal from indoor unit. (Signal from main indoor unit in case of group control)
Ex: Auto address is not completed.
errors
Mis-setting
Error in transmitting serial communication signal.
Indoor unit is detecting error signal from remote controller (and system controller).
Indoor unit is detecting error signal Error in receiving serial communication signal.
from main outdoor unit. 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.
Improper setting of indoor unit or Indoor unit address setting is duplicated.
remote controller.
Remote controller address connector (RCU. ADR) is duplicated.
(Duplication of main remote controller)
Starting auto address setting is prohibited.
During auto address setting,
number of connected units does This alarm message shows that the auto address connector CN054 is
not correspond to number set. shorted while other RC line is executing auto address operation.
Error in auto address setting. (Number of connected indoor units is less
When turning on the power supply,
than the number set.)
number of connected units does
Error in auto address setting. (Number of connected indoor units is more
not correspond to number set.
than the number set.)
(Except R.C. address is "0.")
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.
Improper wiring between main outdoor unit and sub-unit.
Error of sub outdoor unit in receiving serial communication signal from main
outdoor unit.
Serial transmission failure of outdoor unit.
Communications trouble between
Communication failure with MDC
units
Error of main indoor unit in receiving serial communication signal from sub
Indoor unit communication error of
indoor units.
group control wiring.
This alarm message shows when an indoor unit for multiple-use is not
Improper setting.
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-matched connection of outdoor units that have different kinds of
refrigerant.
4-way valve operation failure
Alarm contents
Alarm
message
<E01>
<E02>
<<E03>>
E04
<E06>
E08
<<E09>>
E12
E15
E16
E20
E24
E25
E26
E27
E29
E30
E31
E18
L02
<L03>
L04
Priority set remote controller L05
Non-priority set remote controller L06
L07
L08
<<L09>>
L10
L17
L18
Continued
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