– 102 –
2. Outdoor unit does not operate (but receives remote infrared signal)
Set to room temperature 16°C in the cooling
mode or to 32°C 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.
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 second after it lights?
Perform final operation check.
Check outdoor electrical parts,
and repair any defective parts.
Check outdoor electrical parts,
and repair any defective parts
(around the outdoor interface
transmitting circuit).
Check the indoor interface
transmitting circuit. Replace
IC801.
Check outdoor electrical parts,
and repair any defective parts
(around the outdoor interface
transmitting circuit).
Check the room temperature
thermistor; if it is defective,
replace it.
<Normal values>
10°C ➞ approx. 20kΩ
25°C ➞ approx. 10kΩ
30°C ➞ approx. 8kΩ
Check the heat exchanger
thermistor; if it is defective,
replace it.
<Normal values>
10°C ➞ approx. 20kΩ
25°C ➞ approx. 10kΩ
30°C ➞ approx. 8kΩ
Is the indoor/outdoor unit
communication signal superimposed
on 35V DC of connection wires C
and D?
Is the indoor transmitting signal
being generated at Q801’s
collector?
No
No
No
Yes
Yes
Yes
Yes
Yes
0V
0V
Approx.
35V
Approx.
35V
38kHz Approx. 2Vp-p
38kHz Approx. 2Vp-p
Transmission waveform
Self diagnosis lamps
(LD303, 302, 301)
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