Mitsubishi Electric PUHY-P250YNW-A Service Handbook page 153

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-12 Error Code [4230] Detail Code 125
1. Error code definition
Heatsink overheat protection (Detail code 125)
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above TOH is detected.
models
INV35Y, 36Y
INV37YC
3. Cause, check method and remedy
Cause
(1) Fan board failure
(2) THHS failure
(3) Outdoor unit LEV9 malfunc-
tion
(4) Low-pressure sensor fault
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
20
- chapter 7
TOH
100°C
94°C
Refer to the following page(s).
[8-9-8 Checking the Fan Board Error Detection Circuit at No Load]
[8-9-9 Checking the Fan Board for Damage at No Load]
[8-9-10 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 mode.
LEV9
Refer to the following page(s). [8-8 Troubleshooting LEV Problems]
Refer to the following page(s). [8-5 Pressure Sensor Circuit Configuration and
Troubleshooting Pressure Sensor Problems]
Check method and remedy
BS_07_C