Mitsubishi Electric PUHZ-SHW80YAA Service Manual page 45

<Outdoor unit operation monitor function>
[When optional part "A-Control Service Tool (PAC-SK52ST)" is connected to outdoor controller board (CNM)]
ON
1 2 3 4 5 6
<Digital indicator LED1 working details>
1
The tens digit : Operation mode
Display Operation Model
O OFF / FAN
C COOLING / DRY *
H HEATING
d DEFROSTING
2
Display Inspection unit
0 Outdoor unit
1 Indoor unit 1
2 Indoor unit 2
Display Contents to be inspected (When power is turned on)
63L connector(red) is open.
F3
63H connector(yellow) is open.
F5
2 connectors(63H/63L) are open.
F9
Indoor/outdoor communication error (Signal receiving error) (Outdoor unit)
E8
Indoor/outdoor communication error (Transmitting error) (Outdoor unit)
E9
EA Miswiring of indoor/outdoor unit connecting wire, excessive number of indoor units (4 units or more)
Miswiring of indoor/outdoor unit connecting wire(converse wiring or disconnection)
Eb
Startup time over
EC
Incorrect connection
EE
Communication error except for outdoor unit
E0–E7
OCH651
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The ones digit : Relay output
Display
0
1
2
3
4
5
6
7
8
A
Display Contents to be inspected (During operation)
U1 Abnormal high pressure (63H operated)
U2 Abnormal high discharge temperature, high comp. surface temperature,
shortage of refrigerant
U3 Open/short of outdoor unit thermistors (TH4, TH33)
Open/short of outdoor unit thermistors (TH3, TH32, TH6, TH7 and TH8)
U4
U5 Abnormal temperature of heat sink
U6 Abnormality of power module
U7 Abnormality of superheat due to low discharge temperature
U8 Abnormality in outdoor fan motor
Ud Overheat protection
Compressor overcurrent interruption (When Comp. locked)
UF
UH Current sensor error
UL Abnormal low pressure (63L operated)
UP Compressor overcurrent interruption
P1–P8 Abnormality of indoor units
1 second
interval
ON
1 2 3 4 5 6
Warming-up
Compressor 4-way valve
Compressor
— —
— —
— —
— —
— ON
— ON
— ON
— ON
ON —
ON —
Solenoid valve
— —
— ON
ON —
ON ON
— —
— ON
ON —
ON ON
— —
ON —