Mitsubishi Electric Mr Slim PUHZ-RP50VHA4 Service Manual page 92

<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 error 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 the 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 OFF / FAN
C COOLING / DRY *
H HEATING
d DEFROSTING
*C5 is displayed during replacement operation.
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)
63H connector(yellow) is open.
F5
Indoor/outdoor communication error (Signal receiving error) (Outdoor unit)
E8
Indoor/outdoor communication error (Transmitting error) (Outdoor unit)
E9
Miswiring of indoor/outdoor unit connecting wire, excessive number of indoor units (4 units or more)
EA
Miswiring of indoor/outdoor unit connecting wire(converse wiring or disconnection)
Eb
Startup time over
EC
Communication error except for outdoor unit
E0~E7
OCH451D
Display detail
(Lighting)
Display Contents to be inspected (During operation)
Abnormal high pressure (63H operated)
U1
U2 Abnormal high discharging temperature and comp. surface thermistor, shortage of refrigerant
Open/short circuit of discharging thermistor (TH4) and comp. surface thermistor (TH32)
U3
U4 Open/short of outdoor unit thermistors (TH3, TH6, TH7 and TH8)
Abnormal temperature of heatsink
U5
Abnormality of power module
U6
U7 Abnormality of superheat due to low discharge temperature
Abnormality in outdoor fan motor
U8
Ud Overheat protection
Compressor overcurrent interruption (When Comp. locked)
UF
UH Current sensor error
Abnormal low pressure
UL
Compressor overcurrent interruption
UP
Abnormality of indoor units
P1~P8
Abnormality of refrigerant
PL
A0~A7 Communication error of M-NET system
Explanation for display
1 second
interval
ON
The ones digit : Relay output
Warming-up
Display Compressor
Compressor
— —
0
— —
1
— —
2
— —
3
— ON
4
— ON
5
— ON
6
— ON
7
ON —
8
ON —
A
92
SW2
(Initial setting)
1 2 3 4 5 6
4-way valve
Solenoid valve
— —
— ON
ON —
ON ON
— —
— ON
—
ON
ON ON
— —
ON —
Unit