Hello, colleagues

I am not a colleague per se, I'm an engineer by profession but I have a problem and I hope you will be able to help me. My air conditioner stopped working. When I turn it on, the internal unit seems to be working normally but when the air conditioner tries to switch on the compressor, it dispays an error. The LED Operation blinks 5 times and pauses, and the LED Timer blinks nonstop.

Can you help me with any service documentation, diagrams, instructions how to fix it? I hope I will be able to fix this myself with your help. I will really appreciate any help that you might provide