Error Code 4230 - Mitsubishi Electric PQHY-P72TYHMU-A Service Handbook

[ IX Troubleshooting ]
1. Error Code
4230 (THMU-A)
Heatsink overheat protection
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above TOH is detected.
Model
P72, P96, P120 models
3. Cause, check method and remedy
Cause
(1) Air passage blockage
(2) THHS failure
Refer to section -6- "Inverter (THMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 328)
1. Error Code
4230 (YHMU-A)
Heatsink overheat protection
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above 100°C [212°F] is detected.
3. Cause, check method and remedy
Cause
(1) Air passage blockage
(2) THHS failure
Refer to section -6- "Inverter (YHMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 333)
HWE09080
TOH
100°C [212°F]
Check method and remedy
Check that the heat sink cooling air passage is not blocked
1) Check for proper installation of the INV board IGBT. (Check for proper instal-
lation of the IGBT heatsink.)
2) Check for proper installation of the INV board IGBT.
->If an abnormal value appears, replace the INV board.
Check method and remedy
Check that the heat sink cooling air passage is not blocked
1) Check for proper installation of the INV board IGBT. (Check for proper instal-
lation of the IGBT heatsink.)
2) Check the THHS sensor reading on the LED monitor.
->If an abnormal value appears, replace the INV board.
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