Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 204

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-21 Error Code [4230] Detail Code 125
1. Error code definition
Heatsink overheat protection (Detail code 125)
2. Error definition and error detection method
Outdoor unit
When the heat sink temperature (THHS) remains at or above TOH is detected.
models
INV35Y, 42Y
INV37YC
Hydro unit
When the heat sink temperature (THHS) remains at or above 100°C is detected.
3. Cause, check method and remedy
Outdoor unit
Cause
(1) Fan board failure
(2) THHS failure
(3) Outdoor unit LEV9 malfunc-
tion
(4) Low-pressure sensor fault
Hydro unit
Cause
(1) THHS failure
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
BS_07_E
TOH
100°C
94°C
Refer to the following page(s).
[8-10-8 Checking the Fan Board Error Detection Circuit at No Load]
[8-10-9 Checking the Fan Board for Damage at No Load]
[8-10-10 Checking the Fan Board for Damage with Load]
1) Check for proper installation of the INV board and FAN 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.
Check the operation of the unit in the Cooing or in the Heating mode.
LEV9
Refer to the following page(s). [8-8 Troubleshooting LEV, FCV Problems]
Refer to the following page(s). [8-5 Pressure Sensor Circuit Configuration and
Troubleshooting Pressure Sensor Problems]
1) Check the IGBT on the INV board for proper installation. (Check for proper in-
stallation of the IGBT heatsink.)
Check method and remedy
Check method and remedy
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