Mitsubishi Electric MXZ-2D33VA-E1 Service Manual page 52

Indication
Symptom
No.
LED1(Red) LED2(Yellow)
Outdoor unit
operates.
20
Once Lighted
Twice Lighted
21
22
Lighted
3 times
4 times Lighted
23
5 times Lighted
24
Outdoor unit
25 9 times
operates Lighted
normally.
Lighted Lighted
26
NOTE: 1. The location of LED is illustrated at the right figure. Refer to 11-7.2.
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) The flashing frequency is "2".
ON
2.5-second OFF
OFF
OBH626H
Abnormal point / Condition
The primary current exceeds 15 A (MXZ-3D54/3D68/4D72VA,
Primary current protection
MXZ-3D54VA2)/17 A (MXZ-4D83VA)/18 A (MXZ-5D102VA).
The current of the compressor exceeds 12 A (MXZ-3D54VA/3D54VA2)
Secondary current protection
/12.5A(MXZ-3D68/4D72VA) /10 A (MXZ-4D83/5D102VA).
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
Low discharge
discharge temperature is kept under 50°C (cooling) /40°C (heating)
temperature protection
for 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
-
0.5-second ON
132
Remedy
These symptoms do not mean any abnormality of the
product, but check the following points.
• Check the indoor filters are not clogged.
• Check there is sufficient refrigerant.
• Check the indoor/outdoor unit air circulation is not short
cycling.
• Check the refrigerant circuit and the refrigerant amount.
• Refer to 11-6. "Check of LEV".
• Refer to 11-6. "Check of outdoor thermistors".
• Refer to 11-6. "Check of LEV".
• Check the refrigerant circuit and the refrigerant amount.
This symptom does not mean any abnormality of the
product, but check the following points.
• Check the indoor filters are not clogged.
• Check there is sufficient refrigerant.
• Check the indoor/outdoor unit air circulation is not short
cycling.
-
-
Outdoor control P.C. board(Parts side)
MXZ-3D54/3D68/4D72VA
MXZ-3D54VA2
Lighted
MXZ-4D83/5D102VA
Lighted
LED2 LED1
LED1 LED2