Mitsubishi Electric MUZ-GB50VA, Руководство по обслуживанию

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24
No. Symptom
LED indication
Abnormal point/ Con-
dition
Condition Remedy
LED1(Red) LED2(Yellow)
20
Outdoor unit
operates.
Once Lighting
Primary current pro-
tection
The input current exceeds 15 A. These symptoms do not mean any
abnormality of the product, but
check the following points.
• Check if indoor fi lters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit aircir-
culation is short cycled.
Secondary current pro-
tection
The current of the compressor exceeds 15 A.
21 Twice Lighting
High-Pressure protec-
tion
The indoor gas pipe temperature exceeds 45°C during heating.
Defrosting in cooling The indoor gas pipe temperature falls 3°C or below during
cooling.
22 3 times Lighting
Discharge temperature
protection
The discharge temperature exceeds 100°C during operation. • Check refrigerant circuit and refrig-
erant amount.
• Refer to 11-5. "Check of LEV".
• Refer to 11-5. "Check of outdoor
thermistors’’.
23 4 times Lighting
Low discharge tem-
perature protection
The frequency of the compressor is kept 80 Hz or more and
the discharge temperature is kept under 39°C for more than 20
minutes.
• Refer to 11-5. "Check of LEV".
• Check refrigerant circuit and refrig-
erant amount.
24 5 times Lighting
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 fi lters are clogged.
• Check if refrigerant is short.
• Check if indoor/outdoor unit air cir-
culation is short cycled.
25 Outdoor unit
operates
9 times Lighting Inverter check mode The unit is operated with emergency operation switch. —
26 Lighting Lighting Normal — —