Mitsubishi Electric MXZ-2A40VA Service Manual page 61

Indication
No. Symptom
LED1(Red) LED2(Yellow)
Outdoor unit
21 Once Lighting
operates.
Twice Lighting
22
3 times
23
Lighting
4 times Lighting
24
5 times
25 Lighting
Outdoor unit
operates
26 9 times
Lighting
normally.
Lighting
27
Lighting
Abnormal point / Condition
Primary current protection When the input current exceeds 15A.
Secondary current protection When the current of the compressor exceeds 15A.
High-pressure protection
When the indoor gas pipe temperature exceeds 45: during heating.
Defrosting in cooling When the indoor gas pipe temperature falls 3: or below during cooling.
When the frequency of the compressor is kept 80Hz or more and
Discharge temperature
the discharge temperature is kept under 50:(COOL mode)
protection
/40:(HEAT mode) for more than 40 minutes.
When the frequency of the compressor is kept 80Hz or more and
Low discharge
the discharge temperature is kept under 39: for more than 20
temperature protection
minutes.
Cooling high-pressure
When the outdoor heat exchanger temperature exceeds 58:
protection
during operation.
Inverter check mode When the unit is operated with emergency operation switch.
Normal
Condition
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61
Correspondence
These symptoms do not mean any abnormality of the
product, but check the following points.
• Check if indoor filters 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 13-6.D "Check of LEV".
• Refer to 13-6.F "Check of outdoor thermistors".
• Refer to 13-6.D "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 filters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circulation is short cycled.
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