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[ IX Troubleshooting ]
- 206 -
HWE0803A 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 -7- "Inverter (THMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 293)
4230 (THMU-A)
Model TOH
P72 model 100°C [212°F]
P96, P120 models 90°C [194°F]
Cause Check method and remedy
(1) Fan board failure Refer to IX [4] -7- (2) [6].(page 296)
(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] -7- (2) [5].(page 296)
(3) Air passage blockage Check that the heat sink cooling air passage is not blocked
(4) THHS failure P72 model
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.
P96 andP120 models
3) Check the THHS sensor reading on the LED monitor.
->If an abnormal value appears, check the sensor resistance, and replace the
sensor as necessary.