Mitsubishi Heavy Industries 140KXZEN1, Service Manual, Page: 96 / 166

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94
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E39
E39-1
Discharge pipe temperature
thermistor anomaly (Tho-D1)
Keeps flashing Stays Off
Keeps flashing 1 time flash
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
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 tempeature-resistance characteristics
Temperature-resistance characteristics of
discharge pipe temperature thermistor (Tho-D1)
Save data for 30 minutes before stopping in Mente PC.
YES
NO
Is software version
(L3SC-3.807 or L4JC-1.104)
or newer than(L3SC-3.807
or L4JC-1.104)?
Is the
short connector
connected on CN17
properly?
NO
NO YES
YES
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 short connector on
CN17 firmly.
Insert the connector firmly.
Replace discharge pipe
temperature thermistor
(Tho-D1).
Replace outdoor control
PCB.
2. Error detection method
Detection of anomalously low
temperature (resistance) by
discharge pipe temperature
thermistor
3. Condition of error displayed
• If 3°C or lower is detected for
5 seconds within 10-minutes
to 10-minutes 20-seconds
after the compressor ON and
if this anomaly occurs 3 times
within 40 minutes after the
initial detection.
4. Presumable cause
• Disconnection of the
thermistor harness or the
internal wire of sensing part
(Check the molded part.)
• Disconnection of wire at joint
(connector)
• Disconnection of the
thermistor connector
Note:
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
'17 • KX-SM-272