This indicates that the 1131 might be improperly matched to an older "buzzer" system, or there is a short in the call wire ( CA ). Low Audio: Ensure the wires are clean and not corroded.

Tighten the terminal screws firmly. Avoid over-tightening, which can shear thin copper intercom wires.

Check Terminal 7. Ensure your building uses an AC buzzer system. If your building panel sends an electronic tone instead of an AC voltage, the mechanical buzzer inside the 1131 will not ring. In this scenario, you will need to add a small Urmet electronic ringer module (Model 9854/52) inside the casing. Maintenance and Care

: While the handset is lifted or the call is active, press the door release button to verify the lock triggers. Important Technical Notes Connecting and Replacing Old Intercom with New Urmet 1131

The (Electronic Call) is an analog 4+n system handset designed for clear audio communication and door access control. This model serves as a direct replacement for the 1133 Atlantico and is compatible with most analog systems using electronic call tones. Urmet 1131 Terminal Identification