Hitachi RAS-50WX8W - Page 139

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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.
Does LD301 blink one time?
*Repeats 0.25-second on and 2-second
off.
Does outdoor electrical part
LD301 blink nine times?
Timer Lamp blinks
three times.

"Communication circuit self-
diagnosis" is does by the
operation of the remote
controller.

As for the diagnosis result?
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).
Timer lamp blinks nine times.
Check outdoor electrical parts,
and repair any defective parts.
Check indoor electrical parts,
and repair any defective parts
(around the indoor interface
transmitting circuit).
Does LD303 switch off several
seconds after it lights?
Ye s
Ye s
No
Ye s
Perform final operation check.
Remove the outdoor unit cover and
electrical parts cover, and check self-
diagnosis lamp LD301.
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ＳｅｌｆＤｉａｇｎｏｓｉｓｌａｍｐ
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