Does the low
pressure fluctuate after the
startup?
Is the
sensor connector
OK?
Does it
occur immediately after the
startup?
Are the
sensor characteristics
OK?*
* Refer to page 360 for the
sensor characteristics.
Save data for 30 minutes before stopping in Mente PC
Reset the power and restart operation.
YES
YES
YES
YES
NO
YES
NO
NO
Is the opening
degree of indoor EEV
flucturing?
Is the thermistor
connector of indoor heat
exchanger OK?
Is the checked
result of harness and insulation
of EEV coil OK?
Are the thermistor
characteristics OK?
Does the
EEV operate
normally by judgement
from Mente PC
data, etc?
Isn’t EEV
or strainer
clogged?
NO
YESYES
NO
YES
YES
NO
NO
YES
NO
NO
NO
Check and save the data of
operating condition.
Check error status.
Is the refrigerant amount
OK?
Check additional
refrigerant amount filled
in locally according to the
piping length instracted
on the label pasted on the
pannel.
Check whether the
operation valve opened.
Correct low pressure sensor
connector.
Replace low pressure
sensor.
Replace outdoor control
PCB.
Correct temperature
thermistor connector.
Replace heat exchanger
temperature thermistor.
Replace indoor control
PCB
Replace EEV coil.
Replace EEV main body or
strainer.
Check for short-circuit of
air flow at indoor unit side
and failure of indoor fan
motor.
2. Error detection method
Detected by low pressure sensor
3
.
Condition of error displayed
At startup with power on:
Low pressure ≤0.18 MPa is
detected for 30 seconds, and this
anomaly occurs 5 times within
60 minute.
During operation:
Low pressure ≤0.134 MPa
is detected for 30 seconds or
<0.003 Mpa is detected for 5
seconds. This anomaly occurs 5
times within 60 minute.
4. Presumable cause
• Low pressure sensor
(defective PSL)
• Operation valve closed
• EEV closed (malfunction)
• Insufficient refrigerant
amount
• Clogging (EEV, strainer)
Note: Check whether the outdoor unit is connected to the indoor units in another superlink network?
If it does not recur, connect the Mente PC and continue to collect data.
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