Mitsubishi Heavy Industries FDT100VNAWVH Service Manual page 161

Error code
Indoor display
Remote control:
E39
Outdoor unit
1. Applicable model
All models
2. Error detection method
Detection of anomalously low
temperature (resistance) on
the discharge pipe temperature
sensor
3. Condition of error displayed
When the temperature sensor
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-minute delay, the compressor
starts again automatically, but
if this anomalous temperature
is detected 3 times within 40
minutes.
4. Presumable cause
• Defective outdoor unit main
PCB
• Broken sensor harness or
temperature sensing section
(Check molding.)
• Disconnected wire connection
(connector)
Note:
RUN light
Keeps flashing
Green LED
control PCB
Keeps flashing
5. Troubleshooting
discharge pipe
temperature sensor
connector connected
properly?
Are the
characteristics
of discharge pipe
temperature
sensor OK?
(Broken wire)
200
100
180
温
〔T 80 〕
度 160
セ
140
ン
120
サ
抵
100
50
抗
80
60
(k)
40
20
0
0
0
0
(Short-circuit)
TIMER light
Content
4-time flash
Red LED
temperature sensor anomaly
1-time flash
Diagnosis
Is the
YES
For the characteristics of discharge pipe
temperature sensor, see the following graph.
YES
Temperature-resistance characteristics
T 80
T 80
20 40 60 80 100 120
50 80 100
Temperature (°C)
温 度 〔Ｔ 〕 （ ）
160
- -
'19 • PAC-SM-309
Discharge pipe
Countermeasure
Correct connector.
NO
Defective discharge pipe
NO
temperature sensor ➞
Replace.
Defective outdoor unit
main PCB ➞ Replace.
(Defective temperature
sensor input circuit)
10
温
〔T 80 〕
度
セ
ン
サ
抵
5
抗
(k)
0
140 160