Mitsubishi Heavy Industries FDTC50ZHXV Technical Manual page 331

Error code
Remote controller: E59
1. Applicable model
Model FDC71-250
2. Error detection method
If it fails to change over to
the rotor detection operation
of compressor motor (If the
compressor speed cannot
increase 11Hz or higher)
3. Condition of Error displayed
If compressor fails to startup for
20 times (10 patterns x 2 times).
(It is availabel to reset by
remote controller after 3
minutes delay)
4. Presumable cause
• Faulty outdoor fan motor
• Faulty outdoor control PCB
• Faulty inverter PCB
• Anomalous power supply
voltage
• Improper refrigerant amount
and refrigerant circuit
• Faulty compressor (Motor
bearing)
Note: Insulation resistance
• The unit is left for long period without power supply or soon after installation, migrated liquid refrigerant may dissolve in the refrigerant oil in the compressor.
In such case insulation resistance decreases upto several MΩ or lower. If the electric leakage breaker is activated due to low insulation resistance,
check followings.
➀ Check whehter the insulation resistance can recover or not, ater 6 hours has passed since power ON.
(By energize the crankcase heater, migrated liquid refrigerant in the refrigerant oil in compressor can be evaporated)
➁ Check whether the electric leakage breake conforms to high-hermonic specifications
(As units has inverter, in order to prevent from improper operation, be sure to use high-hermonic one.)
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing 5 times flash
Outdoor
5. Troubleshooting
Diagnosis
Compressor does not start at all.
Neither noise nor vibration cannot be heard
Does
compressor
startup?
NO
Is power
supply voltage
OK?
YES
Is
the pressure balance
at starting OK?
YES
Is the
insulation resistance
and coil resistance of
compressor OK ?
YES
Is power transistor
module OK?
YES
Is it model 200 or 250?
NO
Is
the output of inverter
checker OK ?
YES
Try to startup
several times
Does it start?
321
–
Content
Compressor startup failure
(Model FDC71~250)
Disconnect the outdoor fan motor
connector and try to startup
YES
NO
NO
NO
NO (Inverter PCB is defective)
After power OFF, turn
SW10-4 ON and
connect the inverter
YES
checker. Then power
ON again.
NO
Note: Several times restarting
may resolve it, because migrated
liquid refrigerant in the
compresser is discharged from
the compressor.
NO
–
Countermeasure
Replace outdoor fan motor
Check power supply
voltage
Check refrigerant amount
and refrigerant circuit
Repalce compressor
Replace inverter PCB
* For model 200 and
250, replace the power
transistor as well
Replace inverter PCB
* For model 200 and
250, replace the power
transistor as well
Repalce compressor