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nwpattesting

acet door entry system whining at night

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Hi, I have an old acet door entry system, buzzer and handset for 3 flats, not sure what model pic attached.

 

One of the flats says he gets a whining noise some nights, and goes to the box and hears a whine from that too.

Ive just had a fire alarm fitted, but I think he had it before that ?

 

Can anyone please help ?

thanks

41D80DC6-4CF7-4599-8D7F-5A5A8EF1C81F.jpeg

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Also check that all handsets are seated correctly, feedback is often caused if someone hasnt replaced their handset properly 

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I checked but cant see any volume adjustment on the mic.

So I guess the problem is the handset, not gained access to check that yet. 

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32 minutes ago, nwpattesting said:

I checked but cant see any volume adjustment on the mic.

So I guess the problem is the handset, not gained access to check that yet. 

Normally two pots I thought

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