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Error Code [4230] (Tkmu); Error Code [4230] (Ykmu) - Mitsubishi Electric PURY-HP72 Service Handbook

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[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-17

Error Code [4230] (TKMU)

1. Error code definition
Heatsink overheat protection
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above 90°C [194°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
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems (TKMU)](page 288)
7-6-18

Error Code [4230] (YKMU)

1. Error code definition
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
For inverter-related error codes, refer to the following page(s). [8-11 Troubleshooting Inverter Problems (YKMU)](page 298)
HWE13080
Refer to the following page(s).
[8-10-7 Checking the Fan Board Error Detection Circuit at No Load](page 291)
[8-10-8 Checking the Fan Inverter for Damage at No Load](page 292)
[8-10-9 Checking the Fan Inverter for Damage with Load](page 293)
Check the outdoor unit fan operation.
If any problem is found with the fan operation, check the fan motor.
Refer to the following page(s). [8-10-6 Checking the Fan Motor for Ground Fault and
Coil Resistance Problems](page 291)
Check that the heat sink cooling air passage is not blocked
Check the THHS sensor reading on the LED monitor.
→If an abnormal value appears, check the sensor resistance, and replace the sensor
as necessary.
Refer to the following page(s).
[8-11-7 Checking the Fan Board Error Detection Circuit at No Load](page 301)
[8-11-8 Checking the Fan Inverter for Damage at No Load](page 302)
[8-11-9 Checking the Fan Inverter for Damage with Load](page 303)
Check the outdoor unit fan operation.
If any problem is found with the fan operation, check the fan motor.
Refer to the following page(s). [8-11-6 Checking the Fan Motor for Ground Fault and
Coil Resistance Problems](page 301)
Check that the heat sink cooling air passage is not blocked
1)
Check for proper installation of the INV board IGBT. (Check for proper installation of
the IGBT heatsink.)
2)
Check the THHS sensor reading on the LED monitor.
→If an abnormal value appears, replace the INV board.
- 202 -
Check method and remedy
Check method and remedy
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