28
No. Symptom
Indication
Abnormal point / Condition
Condition
Remedy
LED1
(Red)
LED2
(Yellow)
20
Outdoor
unit oper-
ates.
Once Lighting
Primary current protection
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 protection The current of the compressor exceeds 15 A.
21
Twice Lighting
High-pressure protection
(MUZ)
The indoor gas pipe temperature exceeds 113°F (45°C) dur-
ing heating.
Defrosting in cooling
The indoor gas pipe temperature falls 37°F (3°C) or below
during cooling.
22
3 times
Lighting
Discharge temperature protec-
tion
The discharge temperature exceeds 212°F (100°C) during
operation.
• Check refrigerant circuit and refrigerant amount.
• Refer to 10-5. "Check of LEV".
• Refer to 10-5. "Check of outdoor thermistors".
23
4 times
Lighting
Low discharge temperature
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 refrigerant amount.
24
5 times
Lighting
Cooling high-pressure protec-
tion
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 oper-
ates
9 times
Lighting Inverter check mode
The unit is operated with emergency operation switch.
–
26
Lighting Lighting Normal
–
–
OBH502E
