Hello, the unit hisses/hums even when it is switched off. Does anyone else have this problem? What can I do about it? Otherwise, I am satisfied with the unit. But it is very annoying.

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Our device does the same. As long as it is connected to the power supply. This is very annoying, which is why I returned it. Unfortunately, the replacement appliance is no better. I therefore always disconnect it from the power supply when it is not in use...

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Bought a long time ago 
I don't know what the problem is!

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Question about Philips Azb798t/12

Hello, the unit hisses/hums even when it is switched off. Does anyone else have this problem? What can I do about it? Otherwise, I am satisfied with the unit. But it is very annoying.