Mitsubishi Electric MXZ-2F33VF -E1 Service Manual page 158

Indication
No. Symptom
LED1(Red) LED2(Yellow)
20 Once
21 Twice
22 3 times
Outdoor unit
operates.
23 4 times
24 5 times
25 8 times
26 Outdoor unit
9 times
operates
normally.
27 Lit
NOTE 1. The location of LED is illustrated at the right figure. Refer to 12-7.4.
2. LED is lighted during normal operation.
The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the blinking frequency is "2".
ON
2.5-second OFF
OFF
OBH790H
Abnormal point / Con-
dition
The input current exceeds 8 A (MXZ-2F33VF,
MXZ-2F33VF2, MXZ-2F33VF3)/ 10 A (MXZ-
Primary current protec-
2F42VF, MXZ-2F42VF2, MXZ-2F42VF3, MXZ-
tion
2F53VF/VFH, MXZ-2F53VF2/VFH2, MXZ-
Lit
2F53VF3/VFH3).
Secondary current
The current of the compressor exceeds 17 A.
protection
High pressure protec- The indoor gas pipe temperature exceeds 45°C dur-
tion ing heating.
Lit
The indoor gas pipe temperature falls 3°C or below
Defrosting in cooling
during cooling.
Discharge temperature The discharge temperature exceeds 100°C during
Lit
protection operation.
The frequency of the compressor is kept 68 Hz
(MXZ-2F33VF, MXZ-2F33VF2, MXZ-2F33VF3)/80
Hz (MXZ-2F42VF, MXZ-2F42VF2, MXZ-2F42VF3,
Low discharge
Lit MXZ-2F53VF/VFH, MXZ-2F53VF2/VFH2, MXZ-
temperature protection
2F53VF3/VFH3) or more and the discharge
temperature is kept under 50°C (COOL mode)/40°C
(HEAT mode) for more than 40 minutes.
Cooling high pressure The outdoor heat exchanger temperature exceeds
Lit
protection 58°C during operation.
A failure is detected in the operation of the converter
Lit Converter protection
during operation.
The connector of compressor is disconnected.
Lit Inverter check mode
Inverter check mode starts.
Lit Normal
0.5-second ON
2.5-second OFF
Condition
-
0.5-second ON
158
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 the refrigerant circuit and the refrigerant
amount.
• Refer to 12-6. "Check of LEV".
• Refer to 12-6. "Check of outdoor thermistors".
• Refer to 12-6. "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 if indoor filters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circulation is short
cycled.
• Check the voltage of power supply.
• Replace the inverter P.C. board.
-
-
Outdoor display P.C. board (Parts side)
LED1 LED2
Lit