Just wanna share too. I bought air con from the as well. The installation was really really bad.
After first installation, my air con suddenly switched off after i on for few hours. i called them up and they came down to fix it. Refrigerant leaked cos there was some leak in the pipes. ok, i was still ok with this.
2nd time the refrigerant leaked again. i called the installation guy straight without going back to All Best cos i have the installation guy's no after the first repair. The guy seems like is a norm and offered to come and check w/o asking much. Yes, another pipe at a different area leaked. This time, he taught us how to check if the refrigerant leak. You touch the trunking and if it felt soapy, means there is a leak.
Ok, after that. done. To my horror, my air con switched off by itself again. Hubby n i tried to touch all the trunking and we did not managed to trace the leak. we were so afriad that theleaking pipe was inside the false ceiling. if it is inside the false ceiling, we have to knock it off and mend it back. that would be a nightmare. So, we called the guy again. he came down and checked. this time he said no leak cos he used the pressure gauge. there was no indication of leakage.
So, we called LG straight (we bought the art cool). LG pple came. he checked the pressure guage and said that the installation guys had put in too much refrigerant so much so that my compressor is having prob. the LG guy told me that most installation guys dunno how much refrigerant to put so if they put too much, got pressure, sometimes will cause leak.
these few days cooling, so din switch on air con. hopefully no more prob!