Is the
connector of faulty
thermistor connected
properly?
Are the
characteristics of
thermistor
OK?*1
*1
Check several times the temperature-resistance characteristics of
thermistor to prove any poor connection.
Thermistor temperature-resistance characteristics
Temperature-resistance characteristics of
Ambient air temperature thermistor (Tho-A)
Save data for 30 minutes before stopping in Mente PC
YES
NO
NO
YES
Temperature [T] (°C)
Sensor resistance
Sensor resistance
Check and save the data of
operating condition.
Check the conditions whether
it occurs immediately after the
power on or during operation
or stopping.
Check the sensed value.
Compare the temperature
on Mente PC with actual
measured value.
Insert the connector firmly
Replace ambient air
temperature thermistor
(Tho-A).
Replace outdoor control
PCB.
2. Error detection method
Detection of anomalously
low temperature (resistance)
by ambient air temperature
thermistor
3
.
Condition of error displayed
• if -30°C is detected for 5
seconds within 2-minutes to
2-minutes 20-seconds after
the compressor ON and if this
anomaly occurs 3 times within
40 minutes after the initial
detection.
• If this anomaly occurs 1 time
within 20 seconds after power
ON.
4. Presumable cause
• Disconnection of the
thermistor harness or the
internal wire of sensing part
(Check the molded part)
• Disconnection of the
thermistor connector
• Defective outdoor control
PCB
Note:
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