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[ IX Troubleshooting ]
- 253 -
HWE09080 GB
1. Error Code
Heatsink overheat protection
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above TOH is detected.
3. Cause, check method and remedy
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
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
Refer to section -6- "Inverter (YHMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 333)
4230 (THMU-A)
Model TOH
P72, P96, P120 models 100°C [212°F]
Cause Check method and remedy
(1) Air passage blockage Check that the heat sink cooling air passage is not blocked
(2) THHS failure 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.
4230 (YHMU-A)
Cause Check method and remedy
(1) Air passage blockage Check that the heat sink cooling air passage is not blocked
(2) THHS failure 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.