Hitachi RAS-50WX8 Service Manual page 139

2. Outdoor unit does not operate (but receives remote infrared signal)
Set room temperature 16℃ in the cooling
mode or to 32℃ in the heating mode, and
press the start/stop button.
Remove the outdoor unit cover and
electrical parts cover, and check self-
diagnosis lamp LD301.
Ｙ Ｅ Ｌ
Ｃ Ｎ １ ４
Ｇ Ｒ Ｎ ２
Ｃ Ｎ ２
Ｃ Ｎ ８ Ｃ Ｎ ７
Ｒ Ｅ Ｄ
Ｃ Ｎ １ ５
ＷＨ Ｔ
Ｃ Ｎ ５ Ｃ Ｎ １ ０ Ｃ Ｎ ９
Ｐ ． Ｗ． Ｂ．
Ｓ ｅ ｒ ｖ ｉ ｃ ｅ
Ｓ ｅ ｌ ｆ Ｄ ｉ ａ ｇ ｎ ｏ ｓ ｉ ｓ ｌ ａ ｍ ｐ
Ｓ ｗ ｉ ｔ ｃ ｈ
（ Ｌ Ｄ ３ ０ ３ 、 ３ ０ ２ 、 ３ ０ １ ）
Does LD301 blink one time?
*Repeats 0.25-second on and 2-second
off.
No
Does outdoor electrical part
LD301 blink nine times?
Does LD303 switch off several
seconds after it lights?
Ｎ
Ｂ Ｌ Ｕ
Ｒ Ｅ Ｄ
Ｂ Ｒ Ｎ
Yes
Ｂ Ｌ Ｋ
Ｇ Ｒ Ｎ １ ＷＨ Ｔ
Ｔ ｅ ｒ ｍ ｉ ｎ ａ ｌ
Ｂ ｏ ａ ｒ ｄ ｓ
（Ｍ ａ ｉ ｎ ）
Yes
"Communication circuit self-
diagnosis" is does by the
operation of the remote
controller.
As for the diagnosis result?
Yes
Perform final operation check.
Timer lamp blinks nine times.
Timer Lamp blinks
three times.
– 180 –
Check the room temperature
thermistor, if it is defective,
replace it.
<normal values>
10℃→ approx. 20kΩ
25℃→ approx. 10kΩ
30℃→ approx. 8 kΩ
Check the heat exchanger
thermistor, if it is defective,
replace it.
<normal values>
10℃→ approx. 20kΩ
25℃→ approx. 10kΩ
30℃→ approx. 8 kΩ
Check outdoor electrical parts,
and repair any defective parts
(around the outdoor interface
transmitting circuit).
Check indoor electrical parts,
and repair any defective parts
(around the indoor interface
transmitting circuit).
Check outdoor electrical parts,
and repair any defective parts.