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 Posted: Sunday Nov 6th, 2011 05:47 am
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Joined: Wednesday Aug 9th, 2006
Location: Singapore
Posts: 3493

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Are you hearing the intercom howling using Keypad to Door station, or local phone to Door station or Remote Phone to intercom?
If keypad, which keypad are you using, KP04, KT03 or KP03

What wires are you using for the cables to the Door station? and how far it is?

How far is the door station from the keypad (if you are using the keypad) If they are next to each other then there will be positve feedback between the two

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