Mitsubishi Heavy Industries FDT90VNPWVH Service Manual page 108

Error code
E59
Remote control:
1. Applicable model
All models
2. Error detection method
• If it fails to change over to the
rotor detection operation of
compressor motor
3. Condition of Error displayed
If compressor fails to startup for
42 times
4. Presumable cause
• Faulty outdoor fan motor
• Faulty outdoor unit PCB
• Anomalous power source
voltage
• Improper refrigerant amount
and refrigerant circuit
• Faulty compressor (Motor
bearing)
Note: Insulation resistance
• The unit is left for long period without power source 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
Indoor Keeps flashing Stays OFF
5. Troubleshooting
Diagnosis
Compressor does not start at all.
Neither noise nor vibration cannot be heard
Does
compressor
startup?
NO
Is power
source voltage
OK?
YES
Is
the pressure balance
at starting OK?
YES
Is the
insulation resistance and
resistance between terminals (1)
of compressor OK ?
(1) 0.724Ω or more at 20°C (Model FDC90, 100)
YES
Is power transistor
module OK?
YES
Is
the output of inverter
checker OK ?
YES
Try to startup
several times
Does it start?
107
-
Content
Compressor startup failure
Disconnect the outdoor fan motor
connector and try to startup
YES
NO
NO
NO
NO
NO
Note: Several times restarting
may resolve it, because migrated
liquid refrigerant in the
compresser is discharged from
the compressor.
NO
-
'19 • PAC-SM-334
Countermeasure
Replace outdoor fan motor.
Check power source
voltage.
Check refrigerant amount
and refrigerant circuit.
Repalce compressor.
Defective outdoor unit
PCB➞Replace.
Defective outdoor unit
PCB➞Replace.
Repalce compressor.