Error Codes [4250, 4255, 4256] Detail Codes 106 And 107 - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-18 Error Codes [4250, 4255, 4256] Detail Code 105
1. Error code definition
Overcurrent error due to short-circuited motor (Detail code 105)
2. Error definition and error detection method
When a short is detected on the load side just before starting the inverter operation.
3. Cause, Check method and remedy
In the case of 4250
(1) Short - circuited compressor
(2) Output wiring
In the case of 4255 and 4256
(1) Short - circuited fan motor
(2) Output wiring
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
7-6-19

Error Codes [4250, 4255, 4256] Detail Codes 106 and 107

1. Error code definition
Instantaneous overcurrent (Detail code 106)
Overcurrent (effective value) (Detail code 107)
2. Error definition and error detection method
When a current above the specified value is detected by the electric current sensor.
Refer to the relevant pages for the details of model names and the specified values.
3. Cause, check method and remedy
In the case of 4250
Cause
(1) Inverter output related
(2) The model selection
switches (SW5-3 - 5-8) on
the outdoor unit are set in-
correctly.
BS_07_C
Cause
Cause
Refer to the following page(s).
[8-9-2 Checking the Inverter Board Error Detection Circuit]
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance Problems]
[8-9-4 Checking the Inverter for Damage at No-Load]
[8-9-5 Checking the Inverter for Damage during Compressor Operation]
[8-9-11 Checking the Installation Conditions]
Check the IGBT module resistance value of the INV board, if no problems are
found.
[8-9-15 Troubleshooting Problems with IGBT Module]
Check the setting for the model selection switch on the outdoor unit (Dipswitches
SW5-3 - 5-8 on the outdoor unit control board).
For switch settings, refer to the following page(s). [7-9-2 Error Code [7101]]
Check method and remedy
Refer to the following page(s).
[8-9-3 Checking the Compressor for Ground Fault
and Coil Resistance Problems]
Check for a short circuit.
Check method and remedy
Refer to the following page(s).
[8-9-7 Checking the Fan Motor for Ground Fault and
Coil Resistance Problems]
Check for a short circuit.
Check method and remedy
25
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