Mitsubishi Electric City Multi CMB-P1016NU-G, Service Handbook

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[
IX
Troubleshooting ]
Error Code
Error definition and error
detection method
Cause Check method and remedy
4220 Logic error
(Detail code
No.111) If only the H/W error logic
circuit operates, and no
identifiable error is de-
tected. (1) External noise
(2) Compressor INV board
failure
(3) G/A board failure
(4) IPM failure
(5) DCCT failure
Refer to 9.[4].-7-.(2) [1] and replace
the G/A board.
Refer to 9.[4].-7-.(2) [5] and replace
DCCT.
4230 Heatsink over-
heat protection When the heat sink tem-
perature (THHS1) 95°C
[203°F] or higher is de-
tected. (1) Cooling fan malfunction Check for disconnected connectors
and broken wires.
Check the resistance of the cooling
fan.
Resistance of the cooling fan: Sever-
al hundred ohm -1k ohm
(2) LEV2 failure Refer to the section "Troubleshoot-
ing the LEV."
(3) THINV failure Check for a disconnected thermistor
or broken wire.
Check sensor resistance.
Refer to 6. [2].1.
(4) THHS failure
(5) Blocked air pathway Check for a clogged air passage.
(6) Compressor INV board
cooling fan output failure
Confirm that a voltage of 208/230V
is applied to the compressor INV
board connector CNFAN during in-
verter operation.
(7) Power supply Check the supply voltage.
Make sure that the supply voltage
between the phases is equal to or
greater than 187V.
(8) IPM failure Refer to 9.[4].-7-.(2).[2]
Check for the ground faulting of the
compressor or winding wire prob-
lem.
Refer to 9.[4].-7-.(2).[5]
Check the inverter circuit.