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Code Text Description Cause Check Procedure Technical Support Notes 4250, 4255, 4256 Over current protection High amps drawn by the compressor or an issue with the inverter. Carry out an inverter output test to check if the inverter is working correctly. Use the “inverter testing guide” in the City Multi section of the APP. If the inverter is ok then check the compressor windings for a short or open circuit. Use the service dipswitches on the outdoor unit to get the detail code which will indicate if the issue is with the inverter or compressor. Error Code 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 (INV35Y: CT003, INV42Y: R100, INV37YC: R127) 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
In the case of 4255 and 4256
For inverter-related error codes, refer to the following page(s).
Cause Check method and remedy
(1) Inverter output
Check the IGBT module resistance value of the INV board, if no problems are
found.
[8-10-15 Troubleshooting Problems with IGBT Module]
(2) The model selection
switches (SW5-3 – 5-8) on
the outdoor unit are set
incorrectly.
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]]
(3) Open phase in the powersupply due to improper
power-supply wiring.
Refer to item (6) in section [6-1 Read before Test Run].
Cause Check method and remedy
(1) Fan motor abnormality Refer to the following page(s). [8-10-7 Checking the Fan Motor for Ground Fault
and Coil Resistance Problems]
(2) Fan board failure
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