Mitsubishi Electric MXZ-2A30VA - E1 Service Manual page 128

Indication
Symptom
No.
LED1(Red) LED2(Yellow)
Outdoor unit
operates.
21
Once Lighting
Twice Lighting
22
23
Lighting
3 times
4 times
24 Lighting
5 times Lighting
25
Outdoor unit
26 9 times
operates Lighting
normally.
Lighting Lighting
27
NOTE 1. The location of LED is illustrated at the right figure. Refer to 13-7.2.
2. LED is lighted during normal operation.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is "2".
ON
2.5-second OFF
OFF
Abnormal point / Condition
The input current exceeds 15 A
Primary current protection
17 A (MXZ-4A80VA)/18 A (MXZ-5A100VA)
The current of the compressor exceeds 12 A
Secondary current protection
10 A (MXZ-4A80VA, MXZ-5A100VA)
High-pressure protection
The indoor gas pipe temperature exceeds 45°C during heating.
Defrosting in cooling The indoor gas pipe temperature falls 3°C or below during cooling.
Discharge temperature
The discharge temperature exceeds 100°C during operation.
protection
The frequency of the compressor is kept 80 Hz or more and the discharge
Low discharge
temperature is kept under 50°C (COOL mode) /40°C (HEAT mode) for
temperature protection
more than 40 minutes.
Cooling high-pressure
The outdoor heat exchanger temperature exceeds 58°C during operation.
protection
Inverter check mode The unit is operated with emergency operation switch.
Normal
0.5-second ON
2.5-second OFF
Condition
(MXZ-3A54VA, MXZ-4A71VA)/
.
(MXZ-3A54VA, MXZ-4A71VA)/
.
-
0.5-second ON
128
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. "Check of LEV".
• Refer to 13-6. "Check of outdoor thermistors".
• Refer to 13-6. "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.
-
-
Outdoor electronic control P.C. board(Parts side)
MXZ-3A54VA, MXZ-4A71VA, MXZ-4A80VA-
Lighting
MXZ-4A80VA- , MXZ-5A100VA
E2
Lighting
E1
LED2 LED1
LED1 LED2