Hitachi RAC-50WX8 - Page 135

– 176 –
Blinking other than
one time or Nine times
Does the timer lamp on the indoor unit blink?
Yes
See “Troubleshooting when the timer lamp
blinks”.
Timer lamp
Four times blinking
Check the outdoor electrical parts.
No
Set to room temperature 16℃ in the cooling
mode or to 32℃ in the heating mode, and
press the start/stop button.
Does the operation lamp on the indoor unit
start to light or blink?
No
One time blinking
Remove the decorative cover and electrical parts
cover and check the pin voltages of CN3 (brown
and red wires).
Pin ③: +35 V, pin ①: 0 V
Is approx. 32V to 35V DC being generated?
Is the polarity correct?
Yes
Is the compressor in the outdoor unit operating?
Yes
Check the refrigerating cycle.
No
Remove the outdoor unit cover and
electrical parts cover, and check
self-diagnosis lamp LD301.
Check the indoor electrical parts.
Nine times blinking
Set the service switch on the
outdoor unit to “cooling”. Does the
compressor operate? (After
checking, be sure to return the
service switch to “normal”.)
Check the outdoor electrical parts.
Yes
No
No
Check to see whether the
connecting cord is connected
incorrectly or disconnected.
Normal
Yes
MODEL RAS-50WX8 / RAC-50WX8
RAS-D18EX3 / RAC-D18EX3
CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE
Timer lamp
Three times
blinking
“Communication circuit
self-diagnosis” is done
by the operation of
the remote controller.
The result is?
Ｎ
Ｐ．Ｗ．Ｂ．（Ｍａｉｎ）
Ｓｅｒｖｉｃｅ
Ｓｗｉｔｃｈ
Ｔｅｒｍｉｎａｌ
Ｂｏａｒｄｓ
ＬＤ３０１
ＣＮ１２
ＣＮ６
ＣＮ１８
ＣＮ１４
ＣＮ１３
ＣＮ１１
ＣＮ５ＣＮ１０ ＣＮ９
ＣＮ８
ＣＮ１５
ＣＮ２
ＣＮ７
ＹＥＬ
ＢＬＵ
ＲＥＤ
ＢＲＮ
ＧＲＮ１
ＷＨＴ
ＢＬＫ
ＧＲＮ２
ＲＥＤ
ＷＨＴ
BROWN
CN3
13
CN3
Indoor main P.W.B
561K
820K
CN6
CN3
Indoor main P.W.B
561K
820K
CN6
CN3
Indoor main P.W.B.
561K
820K
CN6