It looks like the error code "0C" or "OC" and the "EL" flashing at a second interval on a Sankey Inverter 12000 split unit, could indicate a compressor overcurrent protection. The "EL" flashing, is an indication of error, this could mean that the unit is not able to cool the room as expected.
The most common cause of this issue is a malfunctioning compressor, which could be caused by a number of things, like a lack of refrigerant, clogged filters, or a malfunctioning thermostat.
To troubleshoot this issue, I would recommend checking the following:
- Make sure the unit is properly charged with refrigerant
- Clean or replace the air filter
- Check the thermostat and make sure it's functioning correctly
- Check the compressor for any visible damage or malfunction
If the problem persists even after checking these things, it's best to call for professional help, as the compressor is a critical component and it's not recommended to work on it by yourself.