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Circuit board on AC unit at home was replaced, turned on unit and new circuit board burned also burned spots at the same locations as older board? What could be the problems?

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You have something in that circuit that's pulling high amps or shorted. You need to determine what is in that circuit fan, compressor, contactor, wiring, etc and fix it first.
Until you fix that you will keep burning up boards.

Posted on Oct 08, 2009

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i think you answered your problem / sounds like the board. some times you can smell the burn and some boards have clicking sound . / from what you have stated . i would replace board. mm the burn is the price of the board .. mm

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1 Answer

Burn out circuit board


hi! there! replace the burn out circiut board,what ever you pull out the same thing you put back just be sure that has the same model and specification,calibrate and test overload protection,defective overload protection replaced to prevent any burn out,short circuited mostly came to burn those thing that's why imposing preventive maintenace schedule for this kind of large ac central unit is very much significant.mostly timer delay circuit malfunction on large scale unit supplying by three phase a/c source on central control panel board.when ever replacement occured try to put mark or list color coding of specific terminals to connect and isolate short circuit make possible to detect at once before installing the new one and make make record on this for future reference we have several cases like that after buying a new one and replaced still burn again,the common cases is that they did not find the cause of short circuit connection they just relay on circuit board burn out,so it better to make assured that every thing is fine before installing the new one.specially on supply source of circuit.,relay on diagram and manuals take and check all data source as reference this will be a great help.take all necessary precaution this should be done by qualified technical ac support,have a nice day and regards

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