Outdoor Unit Operation Monitor Function; Digital Indicator Led1 Working Details; When The Display Blinks - Mitsubishi Electric PUHZ-RP250YHA2 Service Manual

<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 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)
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 opera-
tion.
Display during error postponement
Postponement code is displayed when
compressor stops due to the work of pro-
tection 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.
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
Display detail
(Lighting)
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 worked)
Abnormal high discharging temperature, shortage of refrigerant
U2
U3 Open/short circuit of discharging thermistor(TH4)
U4 Open/short of outdoor unit thermistors(TH3, TH6, TH7 and TH8)
Abnormal temperature of heatsink
U5
U6 Abnormality of power module
Abnormality in outdoor fan motor
U8
Abnormality of voltage
U9
Ud Overheat protection
Compressor overcurrent interruption (When Comp. locked)
UF
Current sensor error
UH
UL Abnormal low pressure
Compressor overcurrent interruption
UP
Abnormality of indoor units
P1~P8
A0~A7 Communication error of M-NET system
Explanation for display
1 second
interval
ON
1
Warming-up
Compressor
Compressor
— —
— —
— —
— —
— ON
— ON
— ON
— ON
ON —
ON —
64
SW2
(Initial setting)
2 3 4 5 6
4-way valve
Solenoid valve
— —
— ON
ON —
ON ON
— —
— ON
ON —
ON ON
— —
ON —
Unit