Mitsubishi Electric MXZ-2A20NA-1 Service Manual page 44

Indication
No. Symptom
LED1(Red) LED2(Yellow)
Outdoor unit
Once Lighting
21
operates.
Twice Lighting
22
3 times
23
Lighting
4 times
24 Lighting
25 5 times Lighting
Outdoor unit
operates
26 9 times Lighting
normally.
Lighting
27
Lighting
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
OFF
Abnormal point / Condition
Primary current protection When the input current exceeds 15A.
Secondary current protection When the current of the compressor exceeds 15A.
High-pressure protection
When the indoor gas pipe temperature exceeds 113˚F during heating.
Defrosting in cooling When the indoor gas pipe temperature falls 37.4˚F or below during cooling.
When the frequency of the compressor is kept 80Hz or more and
Discharge temperature
the discharge temperature is kept under 122˚F(COOL mode)
protection
/104˚F(HEAT mode) for more than 40 minutes.
When 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
When the outdoor heat exchanger temperature exceeds 136.4˚F
protection
during operation.
Inverter check mode When the unit is operated with emergency operation switch.
Normal
2.5-second OFF
Condition
-
0.5-second ON
2.5-second OFF
44
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.
D
• Refer to 11-6. "Check of LEV".
F
• Refer to 11-6. "Check of outdoor thermistors".
D
• 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)
Lighting
0.5-second ON
LED2 LED1