Hitachi RAC-18WEF, Service Manual, Page: 46 / 59

SELF-DIAGNOSIS LIGHTING MODE
MODEL RAC-18/25/35/50WEF
0022422A
※1 DC VOLTAGE VALIDATION, LED POSITION AND FAN OPERATION REFER TO THE SERVICE MANUAL.
LED(※1) INDICATION
LD301
LIT
OPERATION
NORMAL
OVERLOAD
[WIRING DIAGRAM]
DURING COMPRESSOR OPERATE
L N 3 2 1
ON-DEMAND RELAY PWB
LD301
SELF-DIAGNOSE
LED INDICATION DURING STOP
CHECKING POINT&REPAIR METHOD
[OUTDOOR FAN MOTOR CHECK] DIAGNOSIS METHOD OTHERS CHECKING POINT
CONTENT
NORMAL RESISTANCE BETWEEN EACH TERMINAL
ABNOMAL
SWITCHING
FAILURE
RISE
DURING STOP
HIGH LOAD
ABNORMAL
DC VOLTAGE
ERROR
VOLTAGE
POWER SUPPLY
CUT
PEAK CURRENT
SUPPLY
→CHECK CONNECTING CABLE BETWEEN
2.[COMMUNICATION ERROR] OR
→IF OK CHECK F3(2A) FUSE,IF BROKEN
→UN-INSERT THE CONNECTOR AND CHECK
1.[REVERSING VALVE NOT OPERATE ERROR]
5.IF NO ABNORMAL AND FAN MOTOR NORMAL,
3.MAKE SURE NO ABNORMALITIES AT THE FAN SHAFT.
2.UN-INSERT OUTDOOR FAN MOTOR CONNECTOR CN24.
1.SWITCH OFF MAIN POWER SUPPLY.
)
(
ODU(※4) CONTROLLER IS ABNORMAL OR COMPRESSOR IS ABNORMAL
REFER TO THE SERVICE MANUAL [SELF-CHECK]
THE CYCLE PIPE ABNORMAL → CHECK THE CYCLE PIPE
OUTDOOR UNIT SURROUNDING IS BLOCKED → REMOVE THE CAUSE OF BLOCKING.
COMPRESSOR CONNECTOR NOT CONNECTED → CHECK CONNECTOR
SERVICE VALVE NOT OPEN → CHECK SERVICE VALVE
NOT MALFUNCTION
FAN OPERATION※1,WAITING COMPRESSOR TO START → NORMAL
F4 （2A FUSE） BLOWN → CHECK OUTDOOR FAN MOTOR
REACTOR CONNECTOR HALF INSERTION → CHECK REACTOR CONNECTOR
CONNECTING CABLE MISCONNECTION → CHECK CONNECTING CABLE
NO POWER SUPPLY AT TERMINAL “L - N” → CHECK POWER CABLE
THERMISTOR CONNECTOR HALF INSERT → INSERT CONNECTOR SECURELY
COMMUNICATION CIRCUIT ABNORMAL → CHANGE ODU CONTROLLER
F CABLE MISS CONNECTION,DISCONNECTIN → CHECK THE F CABLE
CONDUCT OUTDOOR FAN MOTOR CHECK → REPLACE THE DEFECT PART
SOMETHING BLOCKED SURROUND OUTDOOR UNIT → REMOVE THE OBSTRUCTION
TEMPORARY STOP DUE TO STRONG WIND.→ FAN WILL RE-START MOVING LATER
DUST ON INDOOR UNIT FILTER → CLEAN UP THE FILTER
SERVICE VALVE NOT OPEN → CHECK SERVICE VALVE
CHANGE ODU CONTROLLER（SOME MODELS HAVE NOT 15 TIMES BLINK）
COMPRESSOR LOAD ABNORMAL → INSPECT THE COMPRESSOR
CHANGE ODU CONTROLLER
CIRCUIT
ABNORMAL
STOP
FAN LOCK
STRONG WIND
FAN STOP BY
THERMISTOR
TEMPERATURE
COMPRESSOR
RESET STOP
NORMAL STOP
NO POWER
OFF
REFER TO THE SERVICE MANUAL.
CHANGE ODU CONTROLLER.
CHECK THE LEAD WIRE.
REPLACE THE FUSE OR ODU CONTROLLER.
OUTDOOR UNIT NO OPERATION
INDOOR UNIT AND OUTDOOR UNIT.
※2 SOME MODELS NOT NEED TO INSTALL THE CIRCUITS IN DASH DOT.
CUT THE POWER SOURCE AND WAIT MORE THAN
MEASURE DC VOLTAGE(※1) AND CONFIRMED THAT
IT IS MUST BE LESS THAN 10V.
USE ONE CIRCUIT OF ※A/※B
STATUS
(NORMAL)
DRIVE CIRCUIT
FOR FAN MOTOR DRIVE CIRCUIT
FOR COMPRESSOR
※3 F1 CURRENT VALUE BE DIFFERENT FOR DIFFERENT MODELS.
※4 ODU = OUTDOOR UNIT.
10 MINUTES BEFORE SERVICING WORK.
DANGER (DC350V)
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