Mitsubishi Electric FDT125VNVF Technical Manual page 452

Indoor display
Error code
E59
Remote controller:
inverter PCB
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
• Faulty outdoor fan motor
• Faulty outdoor control PCB
• Faulty inverter PCB
• 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)
RUN light
–
Green LED
Outdoor
control PCB
Keeps flashing
Yellow LED
Outdoor
Stays OFF
5. Troubleshooting
In case that the compressor
does not start at all and no
sound or vibration exists
power supply voltage
For
FDC100-140VS
pressure equalized
at starting OK?
insulation resistance
and coil resistance of
compressor OK?
TIMER light
Content
–
Red LED
Compressor startup failure (1/2)
5 times flash
Diagnosis
Is
OK?
For
YES
FDC100-140VN
Note(1) How to check voltage
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
YES
Is the
YES
To next page
451
- -
Countermeasure
Check the power supply
NO
voltage and correct it
at CN13 ⇒See E51
Replace inverter PCB
YES
If not solved yet, replace
Noise filter PCB
Replace outdoor fan motor.
YES
OK
YES
Check refrigerant amount
NO
and refrigerant circuit.
Replace compressor
NO
'12 • PAC-T-174