Discharge Pipe - Mitsubishi Heavy Industries FDT71VNXVD Service 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
Content
Keeps flashing Stays OFF
Indoor
Keeps flashing 1 time flash
Outdoor
5. Troubleshooting
Diagnosis
Is the

discharge pipe

temperature thermistor
connector connected
properly?
YES
For the characteristics of discharge pipe
Are the
temperature thermistor, see the following graph.
characteristics
of discharge pipe
temperature
thermistor
OK?
Temperature-resistance characteristics
(Broken wire)
200
100
180
温
〔T?80?〕 160
度
T?80?
セ
140
ン
120
サ
100
抵 50
抗
80
60
(k)
40
20
0
0
0 20 40 60
0 50
Temperature (°C)
(Shot circuit)
温 度 〔 Ｔ 〕 （?）
76
- - 86 86
Discharge pipe
temperature thermistor anomaly
NO
NO
YES
10
温
〔T?80?〕
度
セ
T?80?
ン
サ
抵
5
抗
(k)
0
80 100 120 140 160
80 100
- -
'10 • PAC-SM-137A
Countermeasure
Correct connector.
Defective discharge pipe
temperature thermistor
Replace.
Defective outdoor control
PCB Replace.
(Defective temperature
thermistor input circuit)