Mitsubishi Electric PU(H)Y-P250YGM-A Service Handbook page 131

[ IX Troubleshooting ]
Error Code
4220 Logic error
4225 (Detail code
No.111)
4230 Heatsink over-
4235 heat protection
Error definition and error
detection method
If only the H/W error logic
circuit operates, and no
identifiable error is de-
tected.
In the case of 4230
When the heat
sink temperature
(THHS1) 95°C or
higher is detect-
ed.
In the case of 4235
When the heat
sink temperature
(THHS5) 85°C or
higher is detect-
ed.
Cause
In the case of 4220
(1) External noise
(2) Compressor INV board
failure
(3) G/A board failure
(4) IPM failure
(5) DCCT failure
In the case of 4225
(1) External noise
(2) FAN INV board failure
(1) Power supply environment Measure the power supply voltage.
(2) Air passage blockage
(3) Faulty wiring
(4) THHS failure
(5) Compressor INV board
failure and cooling fan fail-
ure
(6) Cooling failure
(7) IPM failure
- 122 -
Check method and remedy
Refer to 9 [4]-6-(2) [1] and replace
the G/A board.
Refer to 9 [4]-6-(2) [5] and replace
DCCT.
Refer to 9 [4]-6-(2) [7].
Ensure that the power supply volt-
age is 342V or more between each
phase.
Check that the heat sink cooling air
passage is not blocked.
Check for cooling fan wiring.
Check for THHS sensor resistor.
Check that a voltage of 220~240V is
applied to the compressor INV board
connector CNFAN while the inverter
is in operation.
Check the cooling fan operation un-
der the above operating conditions.
Refer to 9 [4]-6-(2) [2]
"Check for compressor ground fault
or coil error".
Refer to 9 [4]-6-(2) [5]
"Check the inverter circuit trouble".