The PCB is found faulty.
Programming is not done properly.
sensor is not working properly.
there is usually a problem of leakage from the indoor unit of the AC
there is also Ice formation in the indoor unit of the AC.
We have complained many a times in the samsung, they came n tried to rectify the problem but since the manufacturing defect cant be resolved the problem remained as it is.
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I have had similar problems with Samsung. Apparently, the indoor board fits a lot of different models and each has to be "programmed" in to suit your model. Not sure what was wrong with your machine before but it has been known for these units to have a faulty outdoor fan motor which causes the outdoor board to fail as well. When this happens, the indoor unit will usually work fine for about a minute or 2 and then shut down, with lights flashing. The outdoor wont start at all. If these were the symptoms, I would suggest putting your old indoor PCB back and then getting a new outdoor fan motor and outdoor PCB.
Remove batteries and replace with new batteries and restart. If still problem, unplug DC wire to indoor display sensor and plug it after a minute. Now try with your remote. If still problem, try with another remote. If no result, PCB receiving sensor defective. Replace display sensor or PCB
E-1 Room sensor and A1 Indoor PCB fault. Please you replace first,indoor sensor and reset.Sometimes indoor pcb shows fault code due to sensor short. After replacing sensor it will show only A! or sometimes no error. If it shows A1, you have to repair/replace PCB. Helpful?