Discharge Pipe Temperature Thermistor Anomaly - Mitsubishi Electric FDF71VNXVD Technical Manual

Error code
E39
Remote controller:
1. Applicable model
All models
2. Error detection method
Detection of anomalously low
temperature (resistance) on
the discharge pipe temperature
thermistor
3. Condition of Error displayed
When the temperature thermistor
detects -10°C or lower for 5
seconds continuously within
10 minutes to 10 minutes 20
seconds after the compressor
ON, the compressor stops. After
3-minutes delay, the compressor
starts again automatically, but
if this anomalous temperature
is detected 3 times within 40
minutes.
4. Presumable cause
• Defective outdoor control
PCB
• Broken thermistor harness or
temperature sensing section
(Check molding.)
• Disconnected wire connection
(connector)
Note:
LED Green Red
Keeps flashing Stays OFF
Indoor
Keeps flashing 1 time flash
Outdoor
5. Troubleshooting
Diagnosis
Is the
discharge pipe
temperature thermistor
connector connected
properly?
YES
Are the
characteristics
of discharge pipe
temperature
thermistor
OK?
Temperature-resistance characteristics
(Broken wire)
200
100
180
温
〔T?80?〕
度 160
T?80?
セ
140
ン
120
サ
抵 100
50
抗
80
60
(k)
40
20
0
0
0 20 40
0 50
(Shot circuit)
温 度〔 Ｔ〕 （?）
178
–
Content
Discharge pipe
temperature thermistor anomaly
NO
For the characteristics of discharge pipe
temperature thermistor, see the following graph.
NO
YES
10
温
〔T?80?〕
度
セ
T?80?
ン
サ
抵
5
抗
(k)
0
60 80 100 120 140
80 100
Temperature (°C)
–
'11 • PAC-T-160
Countermeasure
Correct connector.
Defective discharge pipe
temperature thermistor ➞
Replace.
Defective outdoor control
PCB ➞ Replace.
(Defective temperature
thermistor input circuit)
160