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2
Low pressure switch
protection
1
Low discharge temperature
protection
Compressor stop by
p4
thermostat function
Symptom
Display
Detecting method
8
Frequency drop by current
protection
9
Frequency drop by overload
protection
Frequency drop by high
pressure protection
7
Frequency drop by defrosting
in cooling
6
Frequency drop by discharge
temperature protection
3
Frequency drop by high
pressure switch protection
Frequency drop by low
2
pressure switch protection
Symptom
Display
Detecting method
7
Defrost thermistor abnormality
Room-A pipe temperature
5
thermistor abnormality
Room-B pipe temperature
6
thermistor abnormality
Room-C pipe temperature
7
thermistor abnormality
Room-D pipe temperature
9
thermistor abnormality
Power factor detection
4
abnormality
Shell temperature overheat
2
protection
6
Dry protection
When the low pressure has been 0.05Mpa(0.5 kgf/cm
or more, the compressor stops and restarts in 3 minutes.
When the discharge temperature has been 35˚C or below for 50
minutes or more, the compressor stops and restarts operation in 3
minutes.
When the compressor inner thermostat detects 130˚C or above, the
compressor stops and restarts operation in 3 minutes.
Outdoor unit operates. (The compressor operates at reduced frequency.)
Detecting method
When the outdoor unit input current exceeds 22.5 A, the compressor
operates at reduced frequency.
When the compressor load exceeds the specified value, the
compressor operates at reduced frequency.
When indoor pipe temperature exceeds 55˚C during heating, the
compressor operates at reduced frequency.
When the indoor pipe temperature falls to 6˚C or below during cooling,
the compressor operates at reduced frequency.
When the discharge temperature exceeds 115˚C, the compressor
operates at reduced frequency.
When the high pressure exceeds 2.75MPa (28 kgf/cm
compressor operates at reduced frequency. In addition, the two-way
valve reverses and the fan speed changes.
When the low pressure falls to 0.05Mpa or below, the compressor
operates at reduced frequency. In addition, the two-way valve opens.
Outdoor unit operates.
Detecting method
When a short or open circuit occurs in the defrost thermistor during
heating
* In this case, the compressor continues to operate.
When a shot or open circuit occurs in the Room-A pipe temperature
thermistor
* In this case, the compressor keeps running.
When a short or open circuit occurs in the Room-B pipe temperature
thermistor
* In this case, the compressor keeps running.
When a short or open circuit occurs in the Room-C pipe temperature
thermistor
* In this case, the compressor keeps running.
When a short or open circuit occurs in the Room-D pipe temperature
thermistor
* In this case, the compressor keeps running.
When the compressor power factor cannot be detected
* In this case, the compressor keeps running.
When the discharge temperature rises to 95˚C or above in single-unit
cooling operation, the outdoor fan speed changes.
When five degrees or more of temperature difference have been
detected between the indoor main temperature and the auxiliary pipe
temperature for 10 minutes, the target discharge temperature is
reduced.
• Check the ball valve.
2
-G) for 5 minutes
• Check the pipes for bending or clogging
• Check the LEV operation.
• Replace the outdoor controller board.
• Check the amount of gas.
• Replace the outdoor controller board.
• Check the contact of LEV board
connectors.
• Check the inverter output. Refer to
E.
• Check the compressor.
• Check the amount of gas.
• Check the indoor unit air filter for clogging.
• Check the indoor/outdoor air flow for short
cycle.
These symptoms do not mean any abno
mality of the product, but check the
follingpoints.
• Air filter clogging
• Amount of gas
• Short cycle of indoor/outdoor air flow
2
-G), the
• Amount of gas
• Outdoor unit air passage
• Ball valve
• LEV operation
• Pipe bending or clogging
• Outdoor control P.C. board
• Defrost thermistor characteristic
• Contact of P. C. board connectors
• Room A pipe temperature thermistor
characteristic
• Contact of P.C. board connectors
• Room B pipe temperature thermistor
characteristic
• Contact of P.C. board connectors
• Room C pipe temperature thermistor
characteristic
• Contact of P.C. board connectors
• Room D pipe temperature thermistor
characteristic
• Contact of P.C. board connectors
• Compressor wiring
• Outdoor unit air passage
• Pipe length
This
symptom
abnormality in the product, but check the
followings.
• Amount of gas
• Pipe length
A to
Check points
Check points
does
not
mean
any
41
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