Mitsubishi Electric R410A Service Handbook page 286

[8-10 Troubleshooting Inverter Problems (YLMU) ]
Error display/failure condition
[1] Inverter related errors
4250, 4255, 4256, 4220, 4225, 4226, 4230, 4240, 4260,
5301, 5305, 5306, 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] Compressor rotation speed does not reach the specified
speed.
[7] Only the fan motor does not operate.
[8] The fan motor shakes violently at all times or makes an ab-
normal sound.
[9] Noise is picked up by the peripheral device
[10] Sudden malfunction (as a result of external noise.)
HWE14080
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 151)
Refer to the following page(s). [8-10-11 Solutions for the Main No-Fuse Breaker
Trip](page 282)
Refer to the following page(s). [8-10-12 Solutions for the Main Earth Leakage
Breaker Trip](page 282)
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 279)
Refer to the following page(s). [8-10-5 Checking the Inverter for Damage during
Compressor Operation](page 279)
<1> Check for problems with compressor current and heatsink temperature. Re-
fer to the following page(s). [7-1-1 Inverter Protection Level Table](page
155)
<2> Check for imbalance in power supply voltage. *Approximate target: 3% or
less.
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 279)
[8-10-8 Checking the Fan Inverter for Damage at No Load](page 280)
[8-10-9 Checking the Fan Inverter for Damage with Load](page 281)
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 279)
[8-10-8 Checking the Fan Inverter for Damage at No Load](page 280)
[8-10-9 Checking the Fan Inverter for Damage with Load](page 281)
<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 if the inverter output wiring is not running parallel to the power supply
wiring and the transmission lines.
<3> Check that the shielded wire is used as the transmission line when it is re-
quired, 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 de-
tails of the service part settings.)
<6> Provide separate power supply to the air conditioner and other electric ap-
pliances.
<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 Invert-
er for Damage during Compressor Operation](page 279)
*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 re-
quired, 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.
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