Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 257

[ 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 In the case of 4220
circuit operates, and no (1) External noise
identifiable error is de- (2) Compressor INV board
tected.
(3) G/A board failure
(4) IPM failure
(5) DCCT failure
In the case of 4225
(1) External noise
(2) FAN INV board failure
In the case of 4230 (1) Power supply environment Measure the power supply voltage.
When the heat sink
temperature
(THHS1) 95°C
[203°F] or higher is
(2) Air passage blockage
detected.
In the case of 4235
When the heat sink
(3) Faulty wiring
temperature
(4) THHS failure
(THHS1) 85°C
[185°F] or higher is
(5) Compressor INV board
detected.
(6) Cooling failure
(7) IPM failure
Cause
failure
failure and cooling fan fail-
ure
- 248 -
Check method and remedy
Refer to 9 [4]-8-(2) [1] and replace
the G/A board.
Refer to 9 [4]-8-(2) [5] and replace
DCCT.
Refer to 9 [4]-8-(2) [7].
Ensure that the power supply volt-
age is 187V 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 208/230V 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]-8-(2) [2]
"Check for compressor ground fault
or coil error".
Refer to 9 [4]-8-(2) [5]
"Check the inverter circuit trouble".