Mitsubishi Electric PUZ-HWM140VHA Service Manual page 47

<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 control-
ling 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 OFF / FAN
C COOLING / DRY
H HEATING
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
Display Contents to be inspected (When power is turned on)
F3 63L connector(red) is open.
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(reverse wiring or disconnection)
Eb
Startup time over
EC
Incorrect connection
EE
Communication error except for outdoor unit
E0–E7
OCH748
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)
U2 Abnormal high discharge temperature, high comp. surface temperature,
shortage of refrigerant
U3 Open/short of outdoor unit thermistors (TH4, TH33)
U4 Open/short of outdoor unit thermistors (TH3, TH6, TH7, TH8 and TH34)
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
Current sensor error
UH
UL Abnormal low pressure (63L operated)
UP Compressor overcurrent interruption
P1–P8 Abnormality of indoor units
47
The black square (
Explanation for display
1 second
interval
ON
1
Warming-up
Compressor
Compressor
— —
— —
— —
— —
— ON
— ON
— ON
— ON
ON —
ON —
■
) indicates a switch position.
Unit
SW2
(Initial setting)
2 3 4 5 6
4-way valve Solenoid valve
— —
— ON
ON —
ON ON
— —
— ON
ON —
ON ON
— —
ON —