Hitachi RAC-18SX8 Service Manual page 237

Self-check
If you cannot divide the self-diagnosis lamp (blinking 2 times, 3 times, 4 times, 5 times) between the
electrical installation and compressor, conduct the following [self-check].
(The product will energize the intelligent power module on its own and check the inverter.)
・How to conduct self-check diagnosis
1. Shut down the power supply. (Wait at least 10 minutes until the DC voltage discharges.)
2. Pull out the CN30.
3. Turn the power back on and perform air purification on the indoor unit. (The LD302 blinks once.)
4. Press the [test switch] for at least 1 second.
・Energize the IPM and compressor motor in that order and check for short-circuits and openness.
5. Displaying the self-check diagnosis results
・When the self-check is over, the "LD303" will go on. The diagnosis findings are as shown in the
table below.
『Ｓ Ｅ Ｌ Ｆ −Ｃ Ｈ Ｅ Ｃ Ｋ』 Ｉ Ｓ Ｆ Ｉ Ｎ Ｉ Ｓ Ｈ Ｅ Ｄ
SELF-DIAGNOSIS LIGHTING MODE
L L L
D D D
SELF-DIA-
3 3 3
0 0 0
GNOSIS NAME
1 2 3
RED RED RED
NOT ELECTRIFICAL
DEFECTIVE
ONCE
PEAK CURRENT CUT
SIGNAL DETECTION
2TIMES
ABNORMAL COMP-
RESSER CURRENT
7TIMES
ABNORMAL DC
VOLTAGE
10TIMES
EEPROM READING
ERROR
13TIMES
※ Ｅ Ｘ ＡＭ Ｐ Ｌ Ｅ Ｏ Ｆ
BLINKING
(5 TIMES)
If the judgment indicates an abnormality, check the connection line. If nothing is loose or otherwise
defective, follow the correction procedure and replace the defective parts. If the electrical installation
proves to be trouble-free (blinking once), use it after securely inserting the CN30.
※If you forget to insert the CN30, the indoor timer lamp will blink 12 times and the product will not run.
:BLINKING
:LIGHTING
CORRECTION CONTENTS
EXCHANGE OF COMPRESSORS
EXCHANGE OF ELECTRICAL
CONTROLLING BOX.
・ Ｃ Ｈ Ｅ Ｃ Ｋ Ｔ Ｈ Ｅ Ｃ ＯＭ Ｐ Ｒ Ｅ Ｓ Ｓ Ｅ Ｒ
CONNECTOR
・ Ｅ Ｘ Ｃ Ｈ Ａ Ｎ Ｇ Ｅ Ｏ Ｆ Ｅ Ｌ Ｅ Ｃ Ｔ Ｒ Ｉ Ｃ Ａ Ｌ
CONTROLLING BOX.
EXCHANGE OF ELECTRICAL
CONTROLLING BOX.
EXCHANGE OF ELECTRICAL
CONTROLLING BOX.
・ ・ Ｌ Ｉ Ｇ Ｈ Ｔ Ｓ Ｆ Ｏ Ｒ ０ ． ２ ５
2SEC.
SEC. AT INTERVAL
OF 0.25 SEC.
TEST SWITCH
DC VOLTAGE
MESUREMENT
POINT(+)
DC VOLTAGE
MESUREMENT
POINT(-)
IPM
OUTDOOR FAN
MOTOR CONNECTOR
:OFF
CONTROL P.W.B.
LD301
LD302
LD303
CN30 FOR SELF-CHECK
– 270 –