Mitsubishi Electric PUHZ-W85VHA Service Manual page 30

8-7. OUTDOOR UNIT OPERATION MONITOR FUNCTION
Operation indicator SW2: Indicator change of self diagnosis
SW2 setting
ON
1 2 3 4 5 6
<Digital indicator LED3 working details>
(Be sure that the 1 to 6 in the SW2 are set to OFF.)
(1) Display when the power supply is ON.
When the power supply is ON, blinking displays by turns.
Wait for 10 seconds at the longest.
(2) When the display lights (Normal operation)
1 Operation mode display
LED3
The tens digit : Operation mode
Display Operation Model
O OFF
C
COOLING
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
Display Contents to be inspected (When power is turned on)
63H connector (yellow) is open.
F5
Interface unit/Flow temp. controller-outdoor communication error (Signal receiving error) (Outdoor unit)
E8
Interface unit/Flow temp. controller-outdoor communication error (Transmitting error) (Outdoor unit)
E9
Miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire, excessive number of indoor units (2 units or more)
EA
Miswiring of Interface unit/Flow temp. controller-outdoor unit connecting wire (converse wiring or disconnection)
Eb
Startup time over
EC
E0~E7 Communication error except for outdoor unit
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)
U2
Abnormal high discharging temperature, shortage of refrigerant
U3 Open/short circuit of discharging thermistor (TH4)
U4 Open/short of outdoor unit thermistors (TH3, TH32, TH6, TH7 and TH8)
U5 Abnormal temperature of heatsink
U6 Abnormality of power module
U7 Abnormality of superheat due to low discharge temperature
U8 Abnormality in outdoor fan motor
U9 Voltage fault, Input current sensor error
Ud Overheat protection
UF Compressor overcurrent interruption (When Comp. locked)
Current sensor error, Input overcurrent interruption
UH
UP Compressor overcurrent interruption
Freezing/overheating protection is working.
P6
P8 Abnormality of pipe temperature
Abnormal pressure of pressure sensor
UE
Abnormality of inlet water temperature
PE
Serial communication error
Ed
Explanation for display
1 second
interval
ON
1
Warming-up
Compressor
Compressor
— —
— —
— —
— —
— ON
— ON
ON
—
— ON
ON —
—
ON
30
SW2
(Initial setting)
2 3 4 5 6
4-way valve
Solenoid valve
— —
— ON
ON —
ON ON
— —
— ON
ON —
ON ON
— —
ON —
Unit