Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 310

E8
1. Applicable model
All models
2. Error detection method
Indoor heat exchanger
temperature thermistor (ThI-R1,
R2, R3)
3. Condition of Error displayed
When it is detected 5 times
within 60 minutes from initial
detection or when the overload
condition is detected for 6
minutes continuously.
4. Presumable cause
• Clogged air filter
• Defective indoor heat
exchanger temperature
thermistor connector
• Defective indoor heat
exchanger temperature
thermistor
• Anomalous refrigerant system
Note:
During heating operation; After starting compressor, compressor rotation speed is decreased by detecting indoor heat
exchanger temperature (Thi-R) in order to control high pressure.
Keeps flashing 1 time flash
Keeps flashing Stays Off
5. Troubleshooting
Diagnosis
289
–
Heating overload operation
–
Countermeasure
Wash.
Defective indoor heat
exchanger temperature
thermistor connector
Correct.
Defective indoor heat
exchanger temperature
thermistor.
Check refrigerant system.
Adjust