Mitsubishi Electric SEZ-M-DA Series, Руководство по обслуживанию

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104
No. Symptom
Indication
Abnormal point / Con-
dition
Condition Remedy
LED1(Red) LED2(Yellow)
20
Outdoor unit
operates.
Once Lit
Primary current protec-
tion
The input current exceeds 8 A ( MXZ-2F33VF,
MXZ-2F33VF2, MXZ-2F33VF3 )/ 10 A ( MXZ-
2F42VF, MXZ-2F42VF2, MXZ-2F42VF3, MXZ-
2F53VF/VFH, MXZ-2F53VF2/VFH2, MXZ-
2F53VF3/VFH3 ).
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.
Secondary current
protection
The current of the compressor exceeds 17 A.
21 Twice Lit
High pressure protec-
tion
The indoor gas pipe temperature exceeds 45°C dur-
ing heating.
Defrosting in cooling
The indoor gas pipe temperature falls 3°C or below
during cooling.
22 3 times Lit
Discharge temperature
protection
The discharge temperature exceeds 100°C during
operation.
• Check the refrigerant circuit and the refrigerant
amount.
• Refer to 12-6. "Check of LEV".
• Refer to 12-6. "Check of outdoor thermistors".
23 4 times Lit
Low discharge
temperature protection
The frequency of the compressor is kept 68 Hz
( MXZ-2F33VF, MXZ-2F33VF2, MXZ-2F33VF3 )/80
Hz ( MXZ-2F42VF, MXZ-2F42VF2, MXZ-2F42VF3,
MXZ-2F53VF/VFH, MXZ-2F53VF2/VFH2, MXZ-
2F53VF3/VFH3 ) or more and the discharge
temperature is kept under 50°C (COOL mode)/40°C
(HEAT mode) for more than 40 minutes.
• Refer to 12-6. "Check of LEV".
• Check the refrigerant circuit and the refrigerant
amount.
24 5 times Lit
Cooling high pressure
protection
The outdoor heat exchanger temperature exceeds
58°C during operation.
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.
25 8 times Lit Converter protection
A failure is detected in the operation of the converter
during operation.
• Check the voltage of power supply.
• Replace the inverter P.C. board.
26
Outdoor unit
operates
normally.
9 times Lit Inverter check mode The connector of compressor is disconnected.
Inverter check mode starts.
-
27 Lit Lit Normal - -
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”. LED1 LED2
Outdoor display P.C. board (Parts side)
Lit
ON
OFF
2.5-second OFF 2.5-second OFF
0.5-second ON
0.5-second ON
OBH790D