Mitsubishi Electric e Series Service Handbook page 135

[ IX Troubleshooting ]
[1] Inverter related errors
4250, 4220, 4230, 4240, 5301, 5114, 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 abnor-
mal sound.
[6] Noise is picked up by the peripheral device
[7] Sudden malfunction (as a result of external noise.)
HWE20010
Error display/failure condition
Check the details of the inverter error in the error log at maintenance
tool.
Take appropriate measures to the error code and the error details in ac-
cordance with [2] 2.Diagnosing Problems Using Error Codes.
Refer to "(3) Trouble treatment when the main power breaker is
tripped".(page 129)
Refer to "(4) Trouble treatment when the main power earth leakage
breaker is tripped".(page 129)
Check the inverter frequency on the LED monitor and proceed to (2) -
[3] if the compressor is in operation.(page 127)
See (2)-[3].(page 127)
<1> Check that power supply wiring of the peripheral device does not
run close to the power supply wiring of the 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 required, and check that the grounding work is performed prop-
erly 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 fac-
tory for details of the service part settings.)
<6> Provide separate power supply to the air conditioner and other
electric appliances.
<7> If the error occurred suddenly, a ground fault of the inverter output
can be considered. See (2)-[3].(page 127)
*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 prop-
erly on the shielded wire.
<3>Check that neither the transmission line nor the external connec-
tion 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.
- 126 -
Measure/inspection item
GB