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<Outdoor unit operation monitor function>
[When optional part 'A-Control Service Tool (PAC-SK52ST)' is connected to outdoor controller board (CNM)]
Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by
controlling DIP SW2 on 'A-Control Service Tool'.
Operation indicator
SW2: Indicator change of self-diagnosis
SW2 setting
ON
1
2 3 4 5 6
<Digital indicator LED1 working details>
(Be sure that 1 to 6 in the SW2 are set to OFF.)
(1) Display when the power supply ON
When the power supply ON, blinking displays by turns.
Wait for 4 minutes at the longest.
(2) When the display lights (Normal operation)
1 Operation mode display.
LED1
The tens digit: Operation mode
Display
Operation Model
O
C
COOLING / DRY
H
d
DEFROSTING
2 Display during error postponement
Postponement code is displayed when
compressor stops due to the work of
protection device.
Postponement code is displayed while
error is being postponed.
(3) When the display blinks
Inspection code is displayed when compressor stops due to the work of protection devices.
Display Inspection unit
0
Outdoor unit
1
Indoor unit 1
2
Indoor unit 2
3
Indoor unit 3
4
Indoor unit 4
Display Contents to be inspected (When power is turned on)
F5
63H connector(yellow) is open.
E8
Indoor/outdoor communication error (Signal receiving error) (Outdoor unit)
E9
Indoor/outdoor communication error (Transmitting error) (Outdoor unit)
EA
Miswiring of indoor/outdoor unit connecting wire, excessive number of indoor units (4 units or more)
Eb
Miswiring of indoor/outdoor unit connecting wire(reversed wiring or disconnection)
EC
Startup time over
E0–E7 Communication error except for outdoor unit
OCH653C
Display detail
(Lighting)
The ones digit: Relay output
Display
OFF / FAN
HEATING
Display
Contents to be inspected (During operation)
U1
Abnormal high pressure (63H operated)
U2
Abnormal high discharging temperature and comp. surface thermistor, shortage of refrigerant
U3
Open/short circuit of discharging thermistor(TH4) and comp. surface thermistor(TH33)
U4
Open/short of outdoor unit thermistors(TH3, TH6, TH7 and TH8)
U5
Abnormal temperature of heatsink
U6
Abnormality of power module
U7
Abnormality of superheat due to low discharge temperature
U8
Abnormality in outdoor fan motor
Ud
Overheat protection
UF
Compressor overcurrent interruption (When Comp. locked)
UH
Current sensor error
UL
Abnormal low pressure
UP
Compressor overcurrent interruption
PL
Abnormality of refrigerant
P1–PB Abnormality of indoor units
A0–A7 Communication error of M-NET system
Explanation for display
Warming-up
Compressor
Compressor
0
-
1
-
2
-
3
-
4
-
ON
5
-
ON
6
-
ON
7
-
ON
8
ON
A
ON
74
1 second
interval
SW2
ON
(Initial setting)
1
2 3 4 5 6
Solenoid
4-way valve
-
-
-
-
-
ON
-
ON
-
-
ON
ON
-
-
-
ON
Unit
valve
-
ON
-
ON
-
ON
-
ON
-
-
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