Kolin inverter window type A/C. Why did it shut down and display FO code?

The L3 error code in a Kolin inverter window air conditioner typically indicates that there is a problem with the unit's compressor. The compressor is an important component of the air conditioner that helps to cool the air in the room by compressing and circulating refrigerant. If the compressor is not functioning properly, it can cause the air conditioner to stop working or to produce cool air at a reduced rate. Some possible causes of an L3 error code in a Kolin inverter window air conditioner include a faulty compressor, a malfunctioning compressor relay, or a problem with the unit's power supply. To troubleshoot the issue, you may need to perform a diagnostic test on the compressor or contact a professional for assistance.

This may help;
https://www.portableairconditionerbest.com/general/what-does-h3-mean-in-air-conditioner/

Request the manual from Kolin.

Some rat has eaten and desconnected a wire

My personal suggestion would be to go for these repair catalogs. I know this website reliable-store.com that i used to buy them from, and they have
online it was very good manual. Go ahead, I bet.

Hi i am aircon tech, the problem of e5 is fan capacitor & relay connected the fan motor.

If you wish to get more details, check this site. http://electronicshelponline.blogspot.com/ Pull up older posts there. Setup code list and setup proceedings to many popular brand remote controls are given. Two digit, three digit, four digit and five digit setup code list to different models remote controls are given. If you search the site in Timeslide option, which can be selected from the drop down list at the top left of the display window, it will be easy to locate the related post. You can also do a search by type in the brand name and model number to your device into its search box at the top right of display window. Check this link too. http://electrohelponline.blogspot.com/.
Don't mind about the brand name of remote control. Look for codes to your TV brand, whether it is 3 digit, 4 digit or 5 digit; whatisover.

E6 codes

This may be due to the size of the room. The master bedroom may be smaller than the living room? The unit is therefore reaching setpoint temperature and cycling (shutting off)? Or it could also be a faulty thermostat.