Mitsubishi Heavy Industries FDUA160AVSAVH Service Manual page 109

Error code
Indoor control PCB
Remote control: E59
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
3. Condition of error displayed
If the compressor fails to startup
for 20 times (10 patterns ×2
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
From previous page
power transistor
module OK?
After power OFF, turn JSW10-4 of
inverter PCB ON and connect the
inverter checker. Then power ON
again.
inverter output OK?
(Check by inverter
checker.)
Try to restart several times.
Does it start?
Red
Content
Stays OFF
Compressor startup failure (2/2)
5-time flash
Diagnosis
YES
Is the (Inverter PCB anomaly)
NO
YES
Is the
NO
Note(1) Several times restarting
may recover it, because
liquid refrigerant
migrated in the
YES
compressor could be
discharged from the
compressor.
NO
108
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'21 • PAC-SM-398
Countermeasure
Replace inverter PCB.
* Replace power transistor
as well.
Replace inverter PCB.
* Replace power transistor
as well.
Replace compressor.