Mitsubishi Electric SEZ-KD VA Series, Service Manual

Page: 94 / 301

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Primary current protection
Secondary current protection
High-pressure protection
Defrosting in cooling
3 times
Lighted
Discharge temperature
protection
4 times Lighted
Low discharge
temperature protection
• 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.
5 times Lighted
Cooling high-pressure
protection
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.
-
-
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.
Twice Lighted
Once Lighted
The outdoor heat exchanger temperature exceeds 58°C during operation.
9 times
Lighted
Inverter check mode
Lighted Lighted Normal
The unit is operated with emergency operation switch.
-
The primary current exceeds 15 A ( MXZ-3D54/3D68/4D72VA,
MXZ-3D54VA2 )/17 A ( MXZ-4D83VA )/18 A (MXZ-5D102VA) .
The current of the compressor exceeds 12 A ( MXZ-3D54VA/3D54VA2 )
/12.5A( MXZ-3D68/4D72VA ) /10 A ( MXZ-4D83/5D102VA ).
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 (cooling) /40°C (heating)
for more than 40 minutes.
LED1(Red) LED2(Yellow)
Abnormal point / Condition Remedy
Indication
Condition
No.
20
21
22
23
24
25
26
Outdoor unit
operates
normally.
Outdoor unit
operates.
Symptom
Outdoor control P.C. board(Parts side)
LED2 LED1
Lighted
LED1 LED2
Lighted
MXZ-3D54/3D68/4D72VA
MXZ-3D54VA2
MXZ-4D83/5D102VA
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 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”.
OBH626E