Mitsubishi Electric MSZ-D30NA Service Manual page 62

Indication
No. Symptom
LED1 LED2
(Red) (Yellow)
20 Once Lighting
21 Twice Lighting
22 3 times Lighting
Outdoor
unit oper-
ates.
23 4 times Lighting
24 5 times Lighting
25 9 times Lighting
Outdoor
unit oper-
ates
26 Lighting Lighting
Abnormal point / Condition
Primary current protection The input current exceeds 15 A.
Secondary current protection The current of the compressor exceeds 15 A.
High-pressure protection The indoor gas pipe temperature exceeds 113°F (45°C) dur-
(MUZ) ing heating.
The indoor gas pipe temperature falls 37°F (3°C) or below
Defrosting in cooling
during cooling.
Discharge temperature protec- The discharge temperature exceeds 212°F (100°C) during
tion operation.
The frequency of the compressor is kept 80 Hz or more and
Low discharge temperature
the discharge temperature is kept under 102°F (39°C) for
protection
more than 20 minutes.
Cooling high-pressure protec- The outdoor heat exchanger temperature exceeds 136°F (58
tion °C) during operation.
Inverter check mode The unit is operated with emergency operation switch.
Normal –
Condition
28
Remedy
• 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.
• Check refrigerant circuit and refrigerant amount.
• Refer to 10-5. "Check of LEV".
• Refer to 10-5. "Check of outdoor thermistors".
• Refer to 10-5. "Check of LEV".
• Check refrigerant circuit and refrigerant amount.
• 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.
–
–