Mitsubishi Heavy Industries FDT100VNAWVH Service Manual page 173

Error code
Indoor display
Remote control:
E59
Outdoor unit
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
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 unit main PCB
• 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 Check whether the electric leakage breaker conforms to high-harmonic specifications
(As invertr 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
control PCB
Keeps flashing
5. Troubleshooting
In case that the compressor
does not start at all and no
sound or vibration exists
power source voltage
For
FDC100-140VSA-W YES
pressure equalized
at starting OK?
insulation resistance and
resistance between terminals(1)
TIMER light
Content
--
Compressor startup failure (1/2)
Red LED
5-time flash
Diagnosis
Is
OK?
For
FDC100-140VNA-W
Is DC15V
detected after disconnecting
outdoor fan motor?
NO
Replace outdoor unit main PCB
Can compressor startup?
NO
Is the
YES
Is the
of compressor
OK?
(1) 0.448 or more at 20°C (Models FDC100-140VNA-W)
YES 1.044 or more at 20°C (Models FDC100-140VSA-W)
To next page
172
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'19 • PAC-SM-309
Countermeasure
Check the power source
NO
voltage and correct it.
Replace outdoor fan motor.
YES
YES OK
Check refrigerant amount
NO
and refrigerant circuit.
NO
Replace compressor.