Mitsubishi Electric MXZ-2A30VA, Service Manual

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