Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 86

Error code
E39
Remote controller:
E39-1, 2
7-segment display:
*1 E39-1: Tho-D1, E39-2: Tho-D2, *2 E39-1: 1 time flash, E39-2: 2 time flash
1. Applicable model
Outdoor unit
2. Error detection method
Detection of anomalously low
temperature (resistance) of
Tho-D1, D2
3. Condition of error displayed
• If 3°C or lower is detected for
5 seconds continuously within
10-minutes to 10-minutes
20-seconds after the compressor
ON, the compressor stops. And after
3-minutes delay, the compressor
starts again automatically, but if this
anomalous temperature is detected
3 times within 40 minutes after the
initial detection.
4. Presumable cause
• Broken thermistor harness or
the internal wire of sensing
section (Check the molded
section as well)
• Disconnection of thermistor
harness connection (connector)
• Outdoor control PCB anomaly
Note:
LED Green Red
Keeps flashing Stays Off
Indoor
*
Keeps flashing 2
Outdoor
5. Troubleshooting
Diagnosis
Save data for 30 minutes before stopping in Mente PC
Is the
connector of
thermistor connected
properly?
YES
Are the
characteristics of
thermistor
OK? *3
*3
Check several times to prove any poor connection
Temperature-resistance characteristics of discharge
pipe temperature thermistor (Tho-D1, D2)
200
180
160
140
120
100
80
60
40
20
0
0 20 40
Temperature (°C)
84
–
Content
Discharge pipe temperature
thermistor anomaly (Tho-D1, D2)
NO
NO
YES
60 80 100 120 140 160
–
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 securely
Replace thermistor
(Tho-D1 or D2).
Replace outdoor control
PCB.