Error Codes [4250, 4255, 4256] Detail Code 101 - Mitsubishi Electric HP120TNU-A Service Handbook

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-21

Error Codes [4250, 4255, 4256] Detail Code 101

1. Error code definition
IPM error (Detail code 101)
2. Error definition and error detection method
In the case of 4250
If an overcurrent is detected by the overcurrent detection circuit (INV42Y: R100, INV38 (CT001)) on the INV board.
In the case of 4255 and 4256
IPM error signal is detected.
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
incorrectly.
(3) Open phase in the power-
supply due to improper
power-supply wiring.
In the case of 4255 and 4256
Cause
(1) Fan motor abnormality
(2) Fan board failure
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
32
- chapter 7
Check method and remedy
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 Operation]
[8-10-10 Checking the Installation Conditions]
Check the IGBT module resistance value of the INV board, if no problems are
found.
[8-10-14 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]]
Refer to item (6) in section [6-1 Read before Test Run].
Check method and remedy
Refer to the following page(s). [8-10-6 Checking the Fan Motor for Ground Fault
and Coil Resistance Problems]
Refer to the following page(s).
[8-10-7 Checking the Fan Board Error Detection Circuit at No Load]
[8-10-8 Checking the Fan Board for Damage at No Load]
[8-10-9 Checking the Fan Board for Damage with Load]
HWE18220_GB