Mitsubishi Heavy Industries FDT100VNAWVH Service Manual page 160

Error code
Indoor display
Remote control:
E38
Outdoor unit
1. Applicable model
All models
2. Error detection method
Detection of anomalously low
temperature (resistance) on
outdoor air temperature
sensor
3. Condition of error displayed
• When the temperature sensor
detects -45°C or lower for 5
seconds continuously within 2
minutes to 2 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.
• When -45°C or lower is detected for
5 seconds continuously within 20
second after compressor ON.
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
the outdoor air
temperature sensor connector
connected properly?
characteristics of the
outdoor air temperature
sensor OK?
Temperature-resistance characteristics
(Broken wire)
35
30
25
20
15
10
5
0
(Short-circuit)
0 10
TIMER light
Content
1-time flash
Outdoor air temperature
Red LED
1-time flash
Diagnosis
Is
YES
For the characteristics of outdoor air
temperature sensor, see the following graph.
Is the
YES
20 30 40 50
Temperature (°C)
159
- -
'19 • PAC-SM-309
sensor anomaly
Countermeasure
Correct connector.
NO
Defective outdoor air
temperature sensor ➞
NO
Replace.
Defective outdoor unit
main PCB ➞ Replace.
(Defective outdoor air
temperature sensor input
circuit)