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Mitsubishi Electric PURY-HP72 Service Handbook page 300

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[8-10 Troubleshooting Inverter Problems (TKMU) ]
Error display/failure condition
[1]
Inverter related errors
4250, 4255, 4220, 4225, 4230, 4240, 4260, 5301, 5305,
0403
[2]
Main power breaker trip
[3]
Main power earth leakage breaker trip
[4]
Only the compressor does not operate.
[5]
The compressor vibrates violently at all times or makes
an abnormal sound.
[6]
Only the fan motor does not operate.
[7]
The fan motor shakes violently at all times or makes an
abnormal sound.
[8]
Noise is picked up by the peripheral device
[9]
Sudden malfunction (as a result of external noise.)
HWE13080
Measure/inspection item
Implement solutions that correspond to the error codes or preliminary error
codes.[7-1 Error Code and Preliminary Error Code Lists](page 175)
<1> Check the breaker capacity.
<2> Check whether the electrical system is short-circuited or ground-faulted.
<3> If <1> or <2> is not the cause of the problem, refer to the following page(s). [8-
10-11 Solutions for the Main No-Fuse Breaker Trip](page 294)
<1> Check the earth leakage breaker capacity and the sensitivity current.
<2> Meg failure for electrical system other than the inverter
<3> If <1> or <2> is not the cause of the problem, refer to the following page(s). [8-
10-11 Solutions for the Main No-Fuse Breaker Trip](page 294)
Check the inverter frequency on the LED monitor. If the frequency indicates that the
units are in operation, refer to the following page(s). [8-10-5 Checking the Inverter
for Damage during Compressor Operation](page 291)
Refer to the following page(s). [8-10-5 Checking the Inverter for Damage during
Compressor Operation](page 291)
Check the inverter frequency on the LED monitor. If the frequency indicates that the
units are in operation, refer to the following page(s).
[8-10-7 Checking the Fan Board Error Detection Circuit at No Load](page 291)
[8-10-8 Checking the Fan Inverter for Damage at No Load](page 292)
[8-10-9 Checking the Fan Inverter for Damage with Load](page 293)
Check the inverter frequency on the LED monitor. If the frequency indicates that the
units are in operation, refer to the following page(s).
[8-10-7 Checking the Fan Board Error Detection Circuit at No Load](page 291)
[8-10-8 Checking the Fan Inverter for Damage at No Load](page 292)
[8-10-9 Checking the Fan Inverter for Damage with Load](page 293)
<1> Check that power supply wiring of the peripheral device does not run close to
the power supply wiring of the outdoor unit.
<2> Check that the inverter output wiring is not in close contact with the power sup-
ply wiring and the transmission lines.
<3> Check that the shielded wire is used as the transmission line when it is required,
and check that the grounding work is performed properly on the shielded wire.
<4> Meg failure for electrical system other than the inverter
<5> Attach a ferrite core to the inverter output wiring. (Contact the factory for details
of the service part settings.)
<6> Provide separate power supply to the air conditioner and other electric appli-
ances.
<7> If the problem suddenly appeared, inverter output may have had a ground fault.
For details, refer to the following page(s). [8-10-5 Checking the Inverter for
Damage during Compressor Operation](page 291)
*Contact the factory for cases other than those listed above.
<1> Check that the grounding work is performed properly.
<2>Check that the shielded wire is used as the transmission line when it is required,
and check that the grounding work is performed properly on the shielded wire.
<3>Check that neither the transmission line nor the external connection wiring does
not run close to another power supply system or does not run through the same
conduit pipe.
* Contact the factory for cases other than those listed above.
- 289 -
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