Mitsubishi Electric FDT125VNVF Technical Manual page 408

Error code
Indoor control PCB
E59
Remote controller:
Outdoor control PCB
Outdoor inverter
1. Applicable model
All models
2. Error detection method
When it fails to change over to
the operation for rotor position
detection of compressor motor
(If the compressor speed cannot
increase 11Hz or higher)
3. Condition of Error displayed
If the compressor fails to startup
for 20 times (10 patterns x2
times) continuously.
4. Presumable cause
• Outdoor fan motor anomaly
• Outdoor control PCB anomaly
• Inverter PCB anomaly
• Anomalous power supply
voltage
• Insufficient or Excessive
refrigerant amount
• Faulty component for
refrigerant circuit
• Compressor anomaly
(Motor or bearing)
Note: Insulation resistance
• The unit is left for long period without power supply or soon after installation, insulation resistance may decrease to several MΩ or lower due to the liquid refrigerant
migrated in the refrigerant oil in compressor. If the electric leakage breaker is activated due to low insulation resistance, check followings.
➀ Check whether the insulation resistance can recover or not, after 6 hours has passed since power ON.
(By energize the crankcase heater, liquid refrigerant migrated in the refrigerant oil in compressor can be evaporated)
➁ Check whether the electric leakage breaker conforms to high-harmonic specifications
(As INV PAC units has inverter, in order to prevent from improper operation, be sure to use the breaker of high-harmonic type)
LED Green
Keeps flashing
Keeps flashing
Yellow LED Red LED Green LED
PCB
Stays OFF or 4 times flash
5. Troubleshooting
In case that the compressor
does not start at all and no
sound or vibration exists
power supply voltage
For
FDC100-140VS
YES
FDC200, 250VS
pressure equalized
at starting OK?
YES
Is the
insulation resistance
and coil resistance of
compressor OK?
YES
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Red
Content
Stays OFF
5 times flash
Compressor startup failure (1/2)
Keeps flashing
Diagnosis
Is
NO
OK?
For
FDC100-140VN
Note(1) How to check voltage
at CN13 ⇒See E51
⑴
Is DC15V
detected between ② and
③ on CNI3?
⑵
Note(2) Under anomalous
NO
conditions, the voltage
becomes less than
⑵
DC14V
Is DC15V
detected after disconnecting
outdoor fan motor?
NO
Replace outdoor control PCB
Can compressor startup?
NO
Is the
NO
NO
407
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'12 • PAC-T-174
Countermeasure
Check the power supply
voltage and correct it
Replace inverter PCB
YES
If not solved yet, replace
Noise filter PCB
Replace outdoor fan motor.
YES
OK
YES
Check refrigerant amount
and refrigerant circuit.
Replace compressor