Hitachi Utopia PAS-3HVRG, Service Manual

Page: 58 / 127

1-55
TROUBLESHOOTING
Indication on Micro-Computer Input/Output
Thermo Temp. of
Remote Control
Switch
11
Micro-Computer
Input/Output in
Outdoor Unit
13
Cause of Stoppage 14
Abnormality
Occurrence Times
15
Instantaneous Power
Failure Occurrence
Times in Indoor Unit
16
Abnormality
Occurrence Times
on Inverter
18
Transmission Error
Occurrence Times
between Remote
Control Switch and
Indoor Unit (NOTE 1)
17
Louver Sensor 19
Micro-Computer
Input/Output in
Indoor Unit
12
Heating Thermo-ON
Cooling Thermo-ON
Dark
Alarm
Operation
H2
52H
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Countable up to 99.
Over 99 times, "99" is always indicated.
(NOTE 1)
If a transmitting error continues for 30 seconds, one
is added to the occurrence times.
Symbols with a letter Y are relays on PCB
00 Operation OFF, Power OFF
01 Thermo-OFF (NOTE 1), Activating Float Switch
02 Alarm (NOTE 2)
03 Freeze Protection, Overheating Protection
05 Instantaneous Power Failure at Outdoor Unit, Reset
(NOTE 3)
06 Instantaneous Power Failure at Indoor Unit, Reset (NOTE 4)
07 Stoppage of Cooling Operation due to Low Outdoor Air
Temperature, Stoppage of Heating Operation due to
High Outdoor Air Temperature
10 Demand, Enforced Stoppage
13 Retry due to High Pressure Increase
15 Retry due to Abnormal High Temperature of Discharge
Gas, Excessively Low Suction Pressure
16 Retry due to Decrease of Discharge Gas Superheat
17 Retry due to Inverter Tripping, Retry due to Abnormal
Current to Comp.
18 Retry due to Voltage Decrease, Other Retry due to Inverter
19 Expansion Valve Opening Change Protection
20 Operation Mode Changeover of Indoor Unit
21 Enforced Thermo-OFF (Twin Type Only) (NOTE 5)
24 Thermo-OFF during Energy Saving Operation
25 Retry due to Input Protection
(NOTE 1) Explanation of Term,
Thermo-ON:
A condition that an indoor unit is
requesting compressor to operate.
Thermo-OFF: A condition that an indoor unit is not
requesting compressor to operate.
(NOTE 2) Even if stoppage is caused by "Alarm", "02" is not
always indicated.
(NOTE 3) If transmission between the inverter printed circuit board
and the control printed circuit board is not performed
during 30 seconds, the outdoor unit is stopped.
In this case, stoppage is d1-05 cause and the alarm
code "04" may be indicated.
(NOTE 4) If transmission between the indoor unit and the
outdoor unit is not performed during 3 minutes,
indoor units are stopped.
In this case, stoppage is d1-06 cause and the alarm
code "03" may be indicated.
(NOTE 5) In the system "21" will be indicated at twin type,
confirm the stoppage cause of the other indoor unit.
Indication of Unit Stoppage Cause
Abnormality Occurrence Counter
Indication of Automatic Louver Condition
Dark
Y211
Y52C
Outdoor Fan
TEMP.
RUN / STOP
MODE FAN SPEED
VENTI
RESET
CHECK LOUVER
ON/OFF TIMER
TIME
NO FUNCTION
FAN
COOL
HEAT
DRY
AUTO
HIGH
MED
LOW
A/C
VENT
+
SWING
DEFROST
CENTRAL
H.STRG
SERVICE
ON/OFF TIMER SET TEMP.
RN HR
FILTER
T. RUN
ABNML
CHECK
ADDS
UNIT
LOUVER