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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[install monkey]

probably is moisture- as the fuses would have protected the transformer from grounding- also allow the contactors coils for fans,compressor , heaters to dryout otherwise theyll be more to change

[Brian_UK]

The cables appear to have been cut, was this before or after it blew?

[Greek_engineer]

The fuse went off,
What is worthnoticing is the fact that the unit started operating and all were looked well when all of sudden (about 2 minutes since pressing the start button),I heard a strong noise and realised that both the fuse and the transformer had been blown up.

[bigor_2]

Sorry, but this unit is power supply of 230/3/60 . It's possible on your site?