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The EC button stays illuminated because for one reason or another you AC compressor is unable to turn on. This is most often caused by a low level of refridgerant in the system. I would try recharging it first. Make sure when you or whoever you pay to do this recharges the AC, they add the ultraviolet AC leak detection dye. This will allow you to not only pinpoint the location of your leak (if any) but also the severity.
 
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