the transformer suddenly blew up..

[Greek_engineer]

Hello my friends. Recently I inspected a ceiling Carrier indoor unit and after setting that in operation suddenly the transformer of the indoor pcb blew up. I didn’t know why this occurred since the unit had been working for 3 seconds at least. The wiring between indoor and outdoor was correct. I suspect the humidity caused the problem since the unit was stored for about 3 years in a room with no light and high level of moisture. What is your opinion? Is there a chance after putting on operation the unit to have the transformer suddenly blown up?


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