We have a two-year old Sharp air conditioner. It was working perfectly before we went on vacation. When we returned, although it hadn't been used even once, only the fan would work and the unit wouldn't cool at all.
Could be lots of things. Compressor, capacitor, thermostat, sensor for the thermostat, switch. Is the temperature hot enough for the compressor to run?
It is out of warranty. Even the sealed system is only covered for parts, not for labor. If it cannot be easily fixed, it is probably cheaper to trash it and get a new one. The tough part is that you may have to pay a charge to find out it is too expensive to repair.
If you know a little about electricity you may be able to find the problem by using a meter. But then again, if you had a multi-meter and knew how to check you'd probably not be asking here.
With luck, it will be the same thing that happened to mine. Not much older than yours, compressor wouldn't run at first use this spring. Was found to be one of the cartidge fuses (in the box by the compressor) had blown for unknown reasons.
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