Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 251

Error code
Indoor control PCB
Remote control: E59
Outdoor control PCB
Outdoor inverter
1. Applicable model
Models FDC200, 250VSA
2. Error detection method
When it fails to change over to
the operation for rotor position
detection of compressor motor
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 unit control PCB
anomaly
• Inverter PCB anomaly
• Anomalous power source
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 source 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 C heck 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
PCB
4-time flash
5. Troubleshooting
In case that the compressor
does not start at all and no
sound or vibration exists
power source voltage
YES
pressure equalized
at starting OK?
YES
Is the insulation
resistance and resistance
between terminals(1) of
compressor OK?
YES
To next page
Red
Content
Stays OFF
Compressor startup failure (1/2)
1-time flash
(Models FDC200, 250VSA only)
Diagnosis
Is
NO
OK?
Is the
NO
NO
(1) 1.172Ω or more at 20°C (Model FDC200VSA)
0.309Ω or more at 20°C (Model FDC250VSA)
250
- -
'19 • PAC-T-327
Countermeasure
Check the power source
voltage and correct it.
Check refrigerant amount
and refrigerant circuit.
Replace compressor.