I am facing similar problems since last one month. One expert asked for maintenance, got money, and went away.
Second expert filled gas, got money and gone.
Third Export removed heating system, suggested a shade on outdoor unit to save it from sun-light, got money and now nowhere.
4th expert blamed compressor and asked for replacement with new one and suggested for a cheaper solution "Dawlance" compressor. We purchased it, he fixed it, AC was okay only for two hours, then converted into fresh air (room temprature circulation) and then hot air.
Now the gentleman is blaming to voltage as it is not sufficient to pick the load of AC. While other 8 ACs are working fine on the same load, (I think it is light of truck, as now I am suppose to check electricity of whole building, wow what a good trick by the expert).
Now we are going to arrange a stablizer to give him continue power supply of 220. Current voltage is 205-209. Since last 4-5 days we are busy in these negotiations which are not ending.
The problem is that AC when started, works fine only for two hours.
Another expert says, he can fix the problem, but the question is, now again I have to pay whereas I already spent half price of a new AC.
Hussain (firstname.lastname@example.org) 0300-8503800