Hitachi RAS-50WX8 Service Manual page 135

CHECKING THE INDOOR/OUTDOOR UNIT ELECTRICAL PARTS AND REFRIGERATING CYCLE
MODEL RAS-50WX8 / RAC-50WX8
RAS-D18EX3 / RAC-D18EX3
Yes
Does the timer lamp on the indoor unit blink? See "Troubleshooting when the timer lamp
blinks".
No
Check the outdoor electrical parts.
Timer lamp
Set to room temperature 16℃ in the cooling
Four times blinking
mode or to 32℃ in the heating mode, and
Remove the decorative cover and electrical parts
press the start/stop button.
cover and check the pin voltages of CN3 (brown
and red wires).
Pin ③: +35 V, pin ①: 0 V CN3
Does the operation lamp on the indoor unit
start to light or blink?
No
820K
Yes
561K
Is the compressor in the outdoor unit operating?
Yes No CN6
Remove the outdoor unit cover and
electrical parts cover, and check
self-diagnosis lamp LD301.
Indoor main P.W.B.
Is approx. 32V to 35V DC being generated?
Is the polarity correct?
Ｎ
Ｙ Ｅ Ｌ
Ｂ Ｌ Ｕ No
One time blinking
Ｃ Ｎ １ ４
Ｇ Ｒ Ｎ ２
Ｒ Ｅ Ｄ
Ｂ Ｒ Ｎ
Ｃ Ｎ ８ Ｃ Ｎ ７ Ｒ Ｅ Ｄ Ｃ Ｎ ２ Ｂ Ｌ Ｋ
ＷＨ Ｔ Ｃ Ｎ １ ５ Ｇ Ｒ Ｎ １ ＷＨ Ｔ
Ｃ Ｎ ５ Ｃ Ｎ １ ０ Ｃ Ｎ ９
Ｔ ｅ ｒ ｍ ｉ ｎ ａ ｌ
Ｂ ｏ ａ ｒ ｄ ｓ
Ｐ ． Ｗ． Ｂ． （Ｍ ａ ｉ ｎ ） Check to see whether the
Ｓ ｅ ｒ ｖ ｉ ｃ ｅ Ｌ Ｄ ３ ０ １ connecting cord is connected
Ｓ ｗ ｉ ｔ ｃ ｈ incorrectly or disconnected.
Normal
Blinking other than Nine times blinking
one time or Nine times
Set the service switch on the
"Communication circuit
outdoor unit to "cooling". Does the
self-diagnosis" is done
compressor operate? (After by the operation of
the remote controller.
checking, be sure to return the Yes
The result is?
service switch to "normal".)
No
Check the refrigerating cycle.
Check the outdoor electrical parts. Check the indoor electrical parts.
– 176 –
BROWN
1 3
CN3
Yes
Timer lamp
Three times
blinking
CN3 CN3
820K 820K
561K 561K
CN6 CN6
Indoor main P.W.B Indoor main P.W.B