Join Date: Jul 2005
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Aircon shouldn't pack up in 2.5 years.
It's important to run it for at least 30 mins a week, even in winter, to keep the gas circulating. The gas contains lubricant for the compressor and helps keep all the seals flexible.
Most aircon problems are caused by lack of use. By the sound of it, you have been using it quite a lot. Therefore, in my opinion, the warranty should pay up.