Indoor Heat Exchanger Temperature Thermistor Anomaly - Mitsubishi Heavy Industries FDTC50ZHXV Technical Manual

Error code
Remote controller: E6
1. Applicable model
All models
2. Error detection method
Anomalously low temperature
or high temperature (resistance)
is detected on the indoor heat
exchanger thermistor (ThI-R1,
R2 or R3).
3. Condition of Error displayed
• When the temperature
thermistor detects -50°C
or lower for 5 seconds
continuously, the compressor
stops. After 3-minutes delay,
the compressor starts again
automatically, but if this
error occurs again within
60 minutes after the initial
detection.
• Or if 70°C or higher is
detected for 5 seconds
continuously.
4. Presumable cause
• Defective indoor heat
exchanger thermistor
connector
• Indoor heat exchanger
temperature thermistor
anomaly
• 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 indoor heat
exchanger temperature thermistor
connector OK?
YES
Are
characteristics of indoor
heat exchanger temperature
thermistor OK?
Temperature-resistance characteristic
15
10
5
0 10
Temperature (°C)
287
–
Content
Indoor heat exchanger
temperature thermistor anomaly
NO
NO
YES
°C
5kΩ at 25
20 30 40 50
°C
Note (1) 22.5kΩ at -6
–
Countermeasure
Correct.  Insert connector
securely.
Defective indoor heat
exchanger temperature
thermistor  Replace.
Defective indoor control
PCB  Replace.
(Defective indoor unit heat
exchanger temperature
thermistor input circuit)