Samsung AC is not cooling

[lebmfk]

Hi,
I have a Samsung AC model AQ12FANAFR, after an electric sudden cut, it stop cooling when i set the indoor temperature below room temperature, no alarm was showing (no LED blinking). the technician suggests it is a sensor issue, so we borrow the sensor from other similar unit and replace it, then the compressor works well when choosing cooling mode. so the technician purchase a new but non-original sensor and replace it, unfortunately it doesn't work, then i bought the original one from samsung service center but didn't not function properly after installation. However if i use the heating mode, it is OK and when i turn turbo button it starts cooling for 30 min then the compressor go off. in cooling mode the compressor doesn't start at all.
Please help, does it need a reset or PCB got damaged when he used the wrong sensor?
Thanks in advance