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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.
Check the room temperature
thermistor; if it is defective,
replace it.
<Normal values>
10°C approx. 20 kQ
25°C approx. 10 kQ
30°C approx. 8 kQ
Service switch
LD301
Check the heat exchanger
thermistor; if it is defective,
replace it.
<Normal values>
10°C approx. 20 kQ
25°C approx. 10 kQ
- 30°C—approx. 8 kQ
Main P.W.B.
Does LD301 blink one time?
* Repeats 0.25-second on and
2-second off.
| | No
:
YeS
[ig the indoor/outdoor unit
No
Does outdoor electrical part
=> communication signal superimposed
D301 blink nine times?
Oe
ee
36kHz Approx. 2Vp-p
"Ko
—
—-———F
HHt-——
I"
No
Is the indoor transmitting signal
being generated at IC801 pin 7?
36kHz Approx. 2Vp-p
transmission waveform
Check outdoor electrical parts,
and repair any defective parts
(around the outdoor interface
transmitting circuit).
NO | Check the indoor interface
=>
transmitting circuit. Replace
IC801.
Check outdoor electrical parts,
and repair any defective parts
(around the outdoor interface
transmitting circuit).
Check outdoor electrical parts,
and repair any defective parts.
Yes
Does LD303 switch off several SSS
seconds after it lights?
Perform final operation check.
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