Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 308

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:
Keeps flashing 1 time flash
Keeps flashing Stays Off
5. Troubleshooting
Diagnosis
287
–
Indoor heat exchanger
temperature thermistor anomaly
–
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)