Mitsubishi KXZ Series Technical Manual page 270

Error code
Remote control: E39
7-segment display: E39
1. Applicable model
Outdoor unit
2. Error detection method
Detection of anomalously low
temperature (resistance) of
Tho-D1
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 sensor harness or
the internal wire of sensing
section (Check the molded
section as well)
• Disconnection of sensor
harness connection
(connector)
• Outdoor unit control PCB
anomaly
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
sensor connected
properly?
YES
Are the
characteristics of
sensor OK? *3
*3
Check several times to prove any poor connection.
Temperature-resistance characteristics of
discharge pipe temperature sensor (Tho-D1)
200
180
160
140
120
100
80
60
40
20
0
0 20 40
Temperature (°C)
253
-
Content
Discharge pipe temperature
sensor anomaly (Tho-D1)
NO
NO
YES
60 80 100 120 140 160
-
'20 • KX-T-373
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 sensor (Tho-D1).
Replace outdoor unit control
PCB.