Mitsubishi Heavy Industries FDTC40ZHXV Technical Manual page 321

E35
1. Applicable model
Model FDC71 – 250
2. Error detection method
For the error detection method,
refer to the protective control by
controlling compressor rotation
speed and cooling high pressure
protective control of micro
computer control function for
corresponding models.
3. Condition of Error displayed
When outdoor heat exchanger
temperature anomaly is detected
5 times within 60 minutes or
this anomalous state is detected
60 minutes continuously
including compressor stop.
4. Presumable cause
• Defective outdoor heat
exchanger temperature
thermistor
• Defective outdoor control
PCB
• Indoor, outdoor unit
installation spaces
• Short-circuit of air on indoor,
outdoor units
• Fouling, clogging of heat
exchanger
• Excessive refrigerant amount
Note:
Keeps flashing Stays Off
Keeps flashing 1 time flash
5. Troubleshooting
Diagnosis
300
–
Cooling overload operation
(Model FDC71 - 250 only)
–
Countermeasure
Replace outdoor heat
exchanger temperature
thermistor.
Check unit side.
• Isn't the air circulation
of outdoor unit short-
circuited?
• Are installation spaces
adequate?
• Isn't there any fouling
or clogging on heat
exchanger?
Control operation check *
Defective outdoor control
PCB Replace.
Excessive refrigerant
amount : Recharge
refrigerant by weighing
proper amount on a scale.