Outdoor Unit Operation Monitor Function; Digital Indicator Led1 Working Details; When The Display Blinks - Mitsubishi Electric PUZ-A18NHA4 Service Manual

<Outdoor unit operation monitor function>
[When option 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)
1Operation mode display
LED1
The tens digit : Operation mode
Display Operation Model
O OFF / FAN
C COOLING / DRY
H HEATING
d DEFROSTING
2Display 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
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
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 operated)
Abnormal high discharging temperature, shortage of refrigerant
U2
Open/short circuit of discharge thermistor (TH4) and shell thermistor (TH32)
U3
Open/short of outdoor unit thermistors (TH3, TH6, TH7 and TH8)
U4
Abnormal temperature of heatsink
U5
Abnormality of power module
U6
Abnormality in outdoor fan motor.
U8
UF Compressor overcurrent interruption (When Comp. locked)
Current sensor error
UH
UL Abnormal low pressure (63L operated)
Compressor overcurrent interruption
UP
P1~P8 Abnormality of indoor units
Communication error of M-NET system
A0~A7
The black square (
Explanation for display
1 second
interval
ON
1
Warming-up
Compressor
Compressor
— —
— —
— —
— —
— ON
— ON
— ON
— ON
ON —
ON —
76
■
) indicates a switch position.
SW2
(Initial setting)
2 3 4 5 6
4-way valve
Solenoid valve
— —
— ON
ON —
ON ON
— —
— ON
ON —
ON ON
— —
ON —
Unit