Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 212

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-20 Error Code [4220, 4225, 4226] Detail Code 131
1. Error code definition
Low bus voltage at startup (Detail code 131)
2. Error definition and error detection method
When Vdc 289 V is detected just before the inverter operation.
3. Cause, check method and remedy
(1) Inverter main circuit failure
Same as detail code 108 of 4220 error
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
7-6-21 Error Code [4228] Detail Code 101
1. Error code definition
BUS voltage error (Software detection)
2. Error definition and error detection method
"Vdc ≥ 425V" or "Vdc≤150V" was detected during inverter operation.
3. Cause, check method and remedy
(1) Power-supply environment
Find out if there was a (momentary) power failure.
Check that the voltage across L and N is between 198 and 264 VAC.
Check the power-supply voltage waveform for distortion.
(2) Power-supply board failure
Measure the voltage across TBP and TBN on the power-supply board while the inverter is stopped. Check the following if the
voltage is below 239 V.
1) Check the wiring between FT001/FT002 (power-supply board) and ACL for proper connection.
Make sure the short-circuit pin of CN003 (power-supply board) is properly connected.
2) Turn the power back on, and if the problem persists, replace the power-supply board.
Measure the voltage across TBP and TBN on the power-supply board while the inverter is stopped. Check the following if the
voltage is 239 V or above.
1) Turn the power back on, and if the problem persists, replace the power-supply board.
7-6-22 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]
BS_07_M
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 tempera-
ture 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.
39
chapter 7 -