Ensure the handset is properly seated. If it continues, check if the volume pot on the side of the unit is set too high.
Verify if your specific DP-RA01 model requires direct AC power or if it is powered by the signal line. Connecting AC power to a DC-only terminal will destroy the unit. commax dpra01 installation manual link
Keep the intercom wiring at least 30cm away from AC power lines to avoid "humming" or static noise in the audio. Ensure the handset is properly seated
The DP-RA01 typically uses a connection. Cable Type: TIV 0.65mm or higher. Distance: Up to 100 meters (330 feet) using 0.65mm wire. Connecting AC power to a DC-only terminal will
If you are looking for the official PDF documentation, check these common repositories:
Attach the metal or plastic wall bracket to the wall box using the provided screws.
Commax Download Center (Search "DP-RA01") ManualsLib Archive: Commax DP-RA01 Service Manual ManualsBrain Database: DP-RA01 User Guides 🔌 Installation and Wiring Guide If you cannot access the PDF, 1. Wiring Requirements