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Protection mode of CA Azur 540A V2

Hello everybody,

I have a problem with my CA Azur 540A V2.
If the amp is switched on, the Protection mode takes part at once.
The protection LED constantly flashes in single bursts.
Anyone an idea, why does it happen?
How I can follow the fault in the unit, when the protection mode turnes the function off?

I beg your pardon for my english

best regards