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I understand your Frigidaire air conditioner (FAS257Q2A2) is displaying error code A5; however, it appears the correct error code is AS. Error code AS typically indicates that your air conditioner is experiencing an issue with the ambient thermistor. I would strong suggest contacting a professional to check the wiring between the main control board and thermistor. A certified technician would generally replace the faulty part after proper diagnosis. Best regards! - Z
Do you mean error code AS instead of A5? If so, error code AS commonly refers to a sensor issue. Because it is a smaller appliance, repairs are often more costly than the actual unit replacement. You may want to check and see if your dehumidifier is still under warranty and if so, reach out to the manufacturer to determine the exact warranty coverage.
I think what you're actually seeing is an AS error. It's looks like A5 on the LED screen. AS error means their is a sensor failure. So, before calling Frigidaire Tech Service (800-444-4944), turn the Master On/Off Switch to OFF. Unplug the unit for 12 - 15 minutes. This should give the unit ample time to reset itself. Plug the unit back in and turn the Master ON/Off Switch to ON. Now, set your controls as you normally do. If the unit starts up and runs as it should, the problem for now is solved. If it keeps re-occurring, contact Frigidaire Tech Service.
E45 means A board communications problem/ Replace the control board!
At this site below is your manuals, both user manual and instruction manual! http://www.managemyhome.com/mmh/products/ManualSearch.action?product.brandName=FRIGIDAIRE&product.modelNumber=ATF6000ES&intcmp=A5
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