Mitsubishi Electric City Multi PQHY-P72 Service Handbook page 203

[ IX Troubleshooting ]
Error Code
4220 Logic error
(Detail code
No.111)
4230 Heatsink over-
heat protection
Error definition and error
detection method
If only the H/W error logic (1) External noise
circuit operates, and no (2) Compressor INV board
identifiable error is de-
tected. (3) G/A board failure
(4) IPM failure
(5) DCCT failure
When the heat sink tem- (1) Cooling fan malfunction
perature (THHS1) 95°C
[203°F] or higher is de-
tected.
(2) LEV2 failure
(3) THINV failure
(4) THHS failure
(5) Blocked air pathway
(6) Compressor INV board
(7) Power supply
(8) IPM failure
Cause
failure
cooling fan output failure
- 194 -
Check method and remedy
Refer to 9.[4].-7-.(2) [1] and replace
the G/A board.
Refer to 9.[4].-7-.(2) [5] and replace
DCCT.
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
Refer to the section "Troubleshoot-
ing the LEV."
Check for a disconnected thermistor
or broken wire.
Check sensor resistance.
Refer to 6. [2].1.
Check for a clogged air passage.
Confirm that a voltage of 208/230V
is applied to the compressor INV
board connector CNFAN during in-
verter operation.
Check the supply voltage.
Make sure that the supply voltage
between the phases is equal to or
greater than 187V.
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.