Mitsubishi Electric PUHY-HP120TNU-A, Service Handbook, Page: 151 / 324

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
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7-6-17 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.
3. Cause, check method and remedy
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
7-6-18 Error Codes [4235, 4236] Detail Code 125
1. Error code definition
Heatsink overheat protection (Detail code 125) (outdoor unit)
2. Error definition and error detection method
Detection of fan INV heatsink temperature (THHS)
•
100°C
3. Cause, check method and remedy
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
models TOH
INV42Y, INV38 100°C
Cause Check method and remedy
(1) Fan board failure 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]
(2) THHS failure 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.
ĺ
If an abnormal value appears, replace the INV board.
(3) Outdoor unit LEV9 malfunc-
tion 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 Problems]
(4) Low-pressure sensor fault Refer to the following page(s). [8-5 Pressure Sensor Circuit Configuration and
Troubleshooting Pressure Sensor Problems]
Cause Check method and remedy
(1) FAN board fault 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]
(2) Outdoor unit fan failure 1) Check the outdoor unit fan for proper operation.
Check the fan motor if problems are found with the operation of the fan.
Refer to the following page(s). [8-9-7 Checking the Fan Motor for Ground Fault
and Coil Resistance Problems]
(3) Air passage blockage 1) Check the heatsink and the duct for blockage.
Refer to the following page(s). [8-9-16 Checking the Fan Inverter Heatsink for
Clogging]
(4) THHS failure 1) Check the IGBT heatsink for proper mounting.
2) Check the THHS sensor reading on the LED.
ĺ
Replace the INV board if the THHS value is abnormal.