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Mitsubishi Electric PURY-P72 Service Handbook page 216

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[ IX Troubleshooting ]
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)
Fan board failure
(2)
Outdoor unit fan failure
(3)
Air passage blockage
(4)
THHS failure
Refer to section -7- "Inverter (YHMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 301)
HWE0803A
Check method and remedy
Refer to IX [4] -7- (2) [6].(page 304)
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 304)
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.
- 207 -
GB
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