Intake Air Temperature Thermistor Anomaly - Mitsubishi Heavy Industries FDC112KXEN6 Technical Manual

Error code
Remote controller: E7
7-segment display:
1. Applicable model
All models
2. Error detection method
Anomalously low temperature
or high temperature (resistance)
is detected by indoor intake air
temperature thermistor (Thi-A)
3. Condition of error displayed
• When the temperature sensor
detects -50°C or lower for
5 seconds continuously,
the compressor stops.
After 3-minute delay, the
compressor starts again
automatically, but if this
anomaly occurs again within
60 minutes after the initial
detection.
• Or if 48°C or higher is
detected for 5 seconds
continuously.
4. Presumable cause
• Defective intake air
temperature thermistor
connector
• Defective intake air
temperature thermistor
• Faulty indoor control PCB
Note:
LED Green Red
Keeps flashing 1 time flash
Indoor
Keeps flashing Stays Off
Outdoor
5. Troubleshooting
Diagnosis
Is the
connection of intake air
temperature sensor connector
OK?
YES
Are the
characteristics of intake air
temperature sensor
OK?
Temperature-resistance characteristic
15
10
5
0
335
–
Content

Intake air temperature thermistor anomaly

NO
NO
YES
°C
5kΩ at 25
10 20 30 40 50
Temperature (°C)
°C
Note (1) 22.5kΩ at -6
–
Countermeasure
Correct.  Connect
connector.
Defective intake air
temperature thermistor 
Replace.
Defective indoor control
PCB  Replace.
(Defective intake air
temperature thermistor
input circuit)