Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 216

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-26 Error Code [4250, 4255, 4256] Detail Code 104
1. Error code definition
Short-circuited IPM/Ground fault (Detail code 104)
2. Error definition and error detection method
When IPM/IGBT short damage or grounding on the load side is detected just before starting the inverter.
3. Cause, check method and remedy
[Outdoor unit]
In the case of 4250
Cause
(1) Grounding fault compressor
(2) Inverter output related
(3) Open phase in the power-supply
due to improper power-supply wir-
ing
In the case of 4255 and 4256
Cause
(1) Grounding fault of fan motor
(2) Fan board failure
[HBC]
Cause
(1) Grounding fault of pump motor
(2) Pump 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
Refer to the following page(s).
[8-10-3 Checking the Compressor for Ground Fault and Coil Resistance
Problems]
Refer to the following page(s).
[8-10-2 Checking the Inverter Board Error Detection Circuit]
[8-10-3 Checking the Compressor for Ground Fault and Coil Resistance
Problems]
[8-10-4 Checking the Inverter for Damage at No-Load]
[8-10-5 Checking the Inverter for Damage during Compressor Opera-
tion]
[8-10-15 Checking the Installation Conditions]
Refer to item (6) in section [6-1 Read before Test Run]
Check method and remedy
Refer to the following page(s).
[8-10-7 Checking the Fan Motor for Ground Fault and Coil Resistance
Problems]
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]
Check method and remedy
Refer to the following page(s).
[8-10-11 Checking the Pump Motor for Ground Fault and Coil Resis-
tance Problems]
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 op-
eration)]
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