Error Code 4240, 4245, 4246
1. Error code definition
Overload protection
2. Error definition and error detection method
If the output current of “(Iac) >Imax (Arms)” or “THHS > TOL” is continuously detected for 10 minutes during inverter operation.
Refer to the following page(s). [7-1 Error Code and Preliminary Error Code Lists]
3. Cause, check method and remedy
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
Cause Check method and remedy
(1) IPM contact failure Check the IPM and cooling plate for proper contact. (Remove the inverter board,
and check the IPM heatsink grease.)
(2) Air passage blockage Check that the heat sink cooling air passage is not blocked
(3) Power supply environment Power supply voltage is 342 V or above.
(4) Inverter, FAN board failure Refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
(5) Compressor failure Check that the compressor has not overheated during operation.
→ Check the refrigerant circuit (oil return section).
Refer to the following page(s). [8-10-3 Checking the Compressor for Ground
Fault and Coil Resistance Problems]
(6) 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).