Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 205

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-22 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
Cause
(1) FAN board fault
(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]
7-6-23 Error Code [4230] Detail Code 126
1. Error code definition
DCL temperature fault (Detail code 126)(outdoor unit)
2. Error definition and error detection method
When DCL temperature that equals or exceeds 150˚C is detected (applicable to INV37YC only)
3. Cause, check method and remedy
Cause
(1) Contact failure
(2) DCL temperature sen-
sor fault
(3) INV board 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
Check the connector CNTH on the INV board for proper connection.
Disconnect the connector (CNTH), and measure the resistance of the DCL temper-
ature sensor. Replace the DCL temperature sensor if the value is abnormal. Refer
to [3-3 Functions of the Major Components of Outdoor Unit].
Replace the INV board if the problem persists after the operation is resumed.
BS_07_E