Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 213

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-23 Error Code [4235, 4236] Detail Code 125
1. Error code definition
Heatsink overheat protection (Detail code 125)
2. Error definition and error detection method
[Outdoor unit]
Detection of fan INV heatsink temperature (THHS) ≥ 100°C
[HBC]
Detection of pump INV heatsink temperature (THHS) ≥ 100°C
3. Cause, check method and remedy
[Outdoor unit]
Cause
(1) FAN board fault
(2) Outdoor unit fan failure
(3) Air passage blockage
(4) THHS failure
[HBC]
Cause
(1) Pump INV board fault
(2) THHS failure
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
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Check method and remedy
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 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). [8-10-7 Checking the Fan Motor for Ground
Fault and Coil Resistance Problems]
1) Check the heatsink and the duct for blockage.
Refer to the following page(s). [8-10-20 Checking the Fan Inverter Heatsink for
Clogging]
1) Check the IGBT heatsink for proper mounting.
2) Check the THHS sensor reading on the LED.
→ Replace the INV board if the THHS value is abnormal.
Check method and remedy
Refer to the following page(s).
[8-10-12 Checking the Error-Detection Circuit on the Pump INV Board (Without
load)]
[8-10-13 Checking the Pump INV Board for Damage (Without load)]
[8-10-14 Checking the Pump INV Board for Damage (During pump operation)]
1) Check the IGBT heatsink for proper mounting.
2) Check the THHS sensor reading on the LED.
→ Replace the INV board if the THHS value is abnormal.
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