Mitsubishi Electric PURY-P72 Service Handbook page 311

[ IX Troubleshooting ]
[YHMU-A]
Error display/failure condition
[1] Inverter related errors
4250, 4255, 4220, 4225, 4230, 4240,4260, 5301, 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] 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.)
HWE0803A
Measure/inspection item
Check the details of the inverter error in the error log at 10.[1] Table of
LED codes.
Take appropriate measures to the error code and the error details in ac-
cordance with 9. [2] Self-diagnosis on the basis of Error Display on Re-
mote Controller and Remedy for Error.
Refer to "(3) Trouble treatment when the main power breaker is
tripped".
Refer to "(4) Trouble treatment when the main power earth leakage
breaker is tripped".
Check the inverter frequency on the LED monitor and proceed to (2) -
[4] if the compressor is in operation.
See (2)-[4].
Check the inverter frequency on the LED monitor and proceed to (2)-
[6] if the fan motor is in operation.
Check the inverter frequency on the LED monitor and proceed to (2)-
[6] if the fan motor is in operation.
<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 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)-[4].
*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.
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