Discharge Pipe Temperature Thermistor Anomaly (Tho-D1) - Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual

Error code
Remote controller: E39
7-segment display: E39-1
1. Applicable model
KXE6 multi outdoor unit
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:
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing 1 time flash
Outdoor
5. Troubleshooting
Diagnosis
Save data for 30 minutes before stopping in Mente PC
Is the
connector of faulty
thermistor connected
properly?
YES
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)
Temperature [T] (°C)
350
–
Content
Discharge pipe temperature
thermistor anomaly (Tho-D1)
NO
NO
YES
–
Countermeasure
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 discharge pipe
temperature thermistor
(Tho-D1).
Replace outdoor control
PCB.