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[ IX Troubleshooting ]
- 176 -
HWE08040 GB
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 252)
4230 (YHMU-A)
Cause Check method and remedy
(1) Fan board failure Refer to IX [4] -6- (2) [6].(page 255)
(2) Outdoor unit fan failure Check the outdoor unit fan operation.
If any problem is found with the fan operation, check the fan motor. ->Refer to
IX [4] -6- (2) [5].(page 255)
(3) Air passage blockage Check that the heat sink cooling air passage is not blocked
(4) 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.