Mitsubishi Electric MXZ-2B20NA Service Manual page 62

Indication
No. Symptom
LED1(Red) LED2(Yellow)
Outdoor unit
Once Lighted
20 operates.
Twice Lighted
21
3 times
Lighted
22
23
4 times Lighted
5 times
24 Lighted
Outdoor unit
operates 9 times
25 Lighted
normally.
Lighted
26 Lighted
NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1.
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
OBH560G
Abnormal point / Condition
Primary current protection
The input current exceeds 15A.
The current of the compressor exceeds 15A.
Secondary current protection
High-pressure protection
The indoor gas pipe temperature exceeds 113°F during heating.
Defrosting in cooling The indoor gas pipe temperature falls 37.4°F or below during cooling.
The frequency of the compressor is kept 80Hz or more and the discharge
Discharge temperature
temperature is kept under 122°F(COOL mode) /104°F(HEAT mode) for
protection
more than 40 minutes.
The frequency of the compressor is kept 80Hz or more and
Low discharge
the discharge temperature is kept under 102.2°F for more than 20
temperature protection
minutes.
Cooling high-pressure
The outdoor heat exchanger temperature exceeds 136.4°F 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
62
Remedy
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 t1 11-6. "Check of LEV".
• Refer to 11-6. "Check of outdoor thermistors".
• Refer to 11-6. "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-2B20NA
Lighted
MXZ-3B24NA, MXZ-3B30NA
MXZ-4B36NA
Lighted
LED2 LED1
LED1 LED2