Service manual

45
No. Symptom
LED indication
Abnormal point/ Con-
dition
Condition Correspondence
LED1(Red) LED2(Yellow)
20
Outdoor unit
operates.
Once Lighting
Primary current pro-
tection
The input current exceeds 15 A. These symptoms do not mean any
abnormality of the product, but
check the following points.
• Check if indoor fi lters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air
circulation is short cycled.
Secondary current pro-
tection
The current of the compressor exceeds 15 A.
21
Twice Lighting
High-Pressure protec-
tion (MUZ)
The indoor gas pipe temperature exceeds 113°F (45°C) during
heating.
Defrosting in cooling The indoor gas pipe temperature falls 37°F (3°C) or below dur-
ing cooling.
22 3 times Lighting
Discharge temperature
protection
The discharge temperature exceeds 212°F (100°C) during op-
eration.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 10-5. "Check of LEV".
• Refer to 10-5. "Check of outdoor
thermistors".
23
4 times Lighting
Low discharge tem-
perature protection
The frequency of the compressor is kept 80 Hz or more and
the discharge temperature is kept under 102°F (39°C) for more
than 20 minutes.
• Refer to 10-5. "Check of LEV".
• Check refrigerant circuit and refrig-
erant amount.
24 5 times Lighting
Cooling high-pressure
protection
The outdoor heat exchanger temperature exceeds 136°F (58°
C) during operation.
This symptom does not mean any
abnormality of the product, but
check the following points.
• Check if indoor fi lters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air
circulation is short cycled.
25
Outdoor unit
operates
9 times Lighting
Inverter check mode The unit is operated with emergency operation switch.
—
26
Lighting Lighting
Normal
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