The official installation manual and wiring diagrams for the Commax DP-RA01
Some DPRA01 revisions have a small DIP switch to adjust: commax dpra01 installation manual link
: 2-wire connection (non-polarity). Door Release : 2-wire connection to the electric door lock. Power Source : Operates on AC 100-240V, 50/60Hz. The official installation manual and wiring diagrams for
Ensure the handset is properly seated. If it continues, check if the volume pot on the side of the unit is set too high. commax dpra01 installation manual link