Leaks in air conditioners are generally caused from a blockage in the drainage system and can be fixed during an Advanced Clean Air visit.
If your unit stinks it will need a good Advanced Clean Air Service to fix the problem.
If your unit will not turn on at all you can try the "auto" button located under the cover (generally to the right hand side of where your filters are). If this get's the unit running you have a problem with the remote or the receiver. If you don't get any response from your air conditioner it will require a repair technician to identify the problem.
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