Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 309

E7
1. Applicable model
All models
2. Error detection method
Anomalously low temperature
or high temperature (resistance)
is detected by indoor return air
temperature thermistor (Thi-A)
3. Condition of Error displayed
• When the temperature thermistor
detects -50°C or lower for
5 seconds continuously, the
compressor stops. After 3-minute
delay, the compressor starts again
automatically, but if this error
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 return air
temperature thermistor
connector
• Defective return air
temperature thermistor
• Faulty indoor control PCB
Note:
Keeps flashing 1 time flash
Keeps flashing Stays Off
5. Troubleshooting
Diagnosis
288
–
Return air temperature
thermistor anomaly
–
Countermeasure
Correct. Connect
connector.
Defective return air
temperature thermistor
Replace.
Defective indoor control
PCB Replace.
(Defective return air
temperature thermistor
input circuit)