7-6. Meaning Of Alarm Messages - Panasonic U-4LE1E5 Installation Instructions Manual

7-6. 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
(D302, D303) on the outdoor unit PCB. They are also displayed
on the wired remote controller.
●
Viewing the LED 1 and 2 (D302 and D303) alarm displays
LED 1 LED 2
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
N = Alarm No.
Alternating
( : Blinking)
Possible cause of malfunction
Remote controller Error in receiving serial
is detecting error communication signal. (Signal
signal from indoor from main indoor unit in case of
unit. 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).
Indoor unit is Error in receiving serial
detecting error communication signal. When
signal from main turning on the power supply,
outdoor unit. the number of connected indoor
units does not correspond to
the number set. (Except R.C.
address is "0".)
Error of the outdoor unit in
receiving serial communication
signal from the indoor unit.
Improper setting Indoor unit address setting is
of indoor unit or duplicated.
remote controller.
Remote controller address
connector (RCU. ADR) is
duplicated. (Duplication of main
remote controller)
During auto Starting auto address setting is
address setting, prohibited.
number of This alarm message shows that
connected the auto address connector
units does not CN-A.ADD is shorted while
correspond to other RC line is executing auto
number set. address operation.
Error in auto address setting.
When turning
(Number of connected indoor
on the power
units is less than the number
supply, number
set)
of connected
units does not Error in auto address setting.
correspond to (Number of connected indoor
number set. units is more than the number
(Except R.C. set)
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.
Error of sub outdoor unit in
receiving serial communication
signal from main outdoor unit.
Indoor unit Error of main indoor unit in
communication receiving serial communication
error of group signal from sub indoor units.
control wiring.
AMP Air Conditioning
Alarm contents
5: F alarm 6: L alarm
Example: LED 1 blinks 2 times, then
LED 2 blinks 17 times. The cycle then
repeats. Alarm is "P17".
Alarm
message
<E01>
<E02>
<<E03>>
<E06>
<<E09>>
Possible cause of malfunction
Improper setting.
Protective device
in outdoor unit is
activated.
E04
E08
Protective device
in outdoor unit is
activated.
E12
E15
E16
E20
E24
E25
E26
E29
E18
32
www.ampair.co.uk | sales@ampair.co.uk
This alarm message shows
when the 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 Priority set
2 or more remote
indoor units controller
controllers
which have
Non-priority
operation
set remote
mode priority
controller
in 1 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 which have
different kinds of refrigerant.
4-way valve operation failure
Thermal protector in indoor unit
fan motor is activated.
Improper wiring connections of
ceiling panel.
Float switch is activated.
Operation of protective function
of fan inverter
Compressor thermal protector
is activated.
Power supply voltage is
unusual. (The voltage is more
than 260 V or less than 160 V
between L and N phase.)
Incorrect discharge
temperature. (Comp. No. 1)
Power supply circuit failure,
missing-phase detection.
Forgot to open service valve
O sensor (detects low oxygen
2
level) activated.
Compressor running failure
resulting from missing phase
in the compressor wiring, etc.
(Start failure not caused by
IPM or no gas.)
Outdoor unit fan motor is
unusual.
IPM trip (IPM current or
temperature)
Missing-phase/reverse-phase
in the compressor wiring,
Compressor start-up failure
(Overcurrent at time of INV
compressor starts up, etc.)
Alarm
message
L02
<L03>
L04
L05
L06
L07
L08
<<L09>>
L10
L17
L18
<<P01>>
<<P09>>
<<P10>>
<<P12>>
P02
P03
P05
P13
P14
P16
P22
H31
P29
continued