Someone rings the video intercom but the monitor does not make any sound. This is one of the most frustrating problems for users and installers because the system seems to work (there is an image, the door can be opened) but the doorbell does not ring. In this guide, we explain all possible causes and how to rule them out one by one.
1. Check the monitor volume
It seems obvious, but it is the first point to check. In many Tegui monitors, the doorbell volume can be adjusted independently from the call volume.
- Access the monitor's configuration menu.
- Look for the option Doorbell volume or Ringtone.
- Make sure it is not set to zero or silent mode.
- In some models (such as the Classe 100X16E WiFi), the volume is adjusted from the touchscreen under Settings → Sound.
2. Verify the jumper M settings
In Tegui monitors, the jumper M controls the device's operating mode, including the doorbell behavior. An incorrect setting can cause the monitor not to ring when receiving a call.
- Consult your model's manual to identify the correct jumper M values.
- If you have recently replaced the monitor, check that the M setting matches the previous monitor.
- The value M=0 is the standard for normal operation with the doorbell active.
👉 Related article: Guide to configuring the N, P, and M jumpers on Tegui and BTicino monitors
3. Check the system power supply
Insufficient or unstable power can cause the monitor to receive the call signal but not have enough energy to activate the doorbell speaker.
- Measure the voltage at the monitor terminals with a multimeter.
- Check that the Tegui power supply (Ref. 346050 or similar) is in good condition.
- If you have several monitors or accessories connected, check that the maximum load of the power supply is not exceeded.
👉 Related article: How many monitors can I connect to my Tegui video intercom?
4. Check the wiring between the panel and the monitor
In 2-wire systems, the call signal travels through the same BUS as the video and audio. A wiring problem can affect only the doorbell if the signal degradation is partial.
- Verify that the cables are securely attached to the terminals of the monitor and the outdoor panel.
- Check that there are no rusty splices or loose connections.
- In long installations, voltage drop can be enough to affect the doorbell but not the image.
5. Problem on the outdoor panel: defective button
If the monitor shows an image when someone approaches (in models with motion detection) but does not ring when the button is pressed, the problem may be with the button on the outdoor panel.
- Try pressing the button firmly several times.
- Check if the button shows signs of wear, moisture, or rust.
- With a multimeter, check that the button makes proper contact when pressed.
- If the button is defective, it may be necessary to replace the external panel.
👉 Related article: Sfera New BTicino panels: complete guide for installers
6. The monitor is in “Do not disturb” or “Away” mode
Some modern Tegui monitors (especially WiFi models) have a “Do not disturb” mode that silences the doorbell for a set period.
- Check in the monitor menu if any silence or absence mode is activated.
- In the Classe 100X16E WiFi, this setting is found in Settings → Do not disturb.
- Deactivate it and try again.
7. Internal speaker failure in the monitor
If you have ruled out all previous causes and the monitor still does not ring, the internal speaker may be damaged.
- Check if the monitor emits sound in other situations (menu, door opening confirmation).
- If it does not emit any sound at all, the speaker may be defective.
- In that case, it is necessary to replace the monitor.
👉 Related article: Which Tegui BTicino monitor to buy? Guide according to your installation
Summary: quick diagnostic steps
- Check the doorbell volume in the monitor menu.
- Verify that “Do not disturb” mode is not activated.
- Check the jumper M configuration.
- Measure the power supply at the monitor terminals.
- Inspect the wiring and connections.
- Check the button on the external panel.
- If nothing works, check the internal speaker of the monitor.
Frequently asked questions
Why does the Tegui video doorbell sometimes ring and sometimes not?
A flashing doorbell usually indicates an unstable power supply, a loose connection in the wiring, or a doorbell button with poor contact. First check the connections and the power supply voltage.
Can I change the doorbell tone on Tegui monitors?
Yes, in newer models like the Classe 100X16E WiFi you can select from several ringtones in the sound settings menu.
Can the Tegui video doorbell ring on the mobile even if the monitor does not ring?
Yes, if you have a WiFi monitor linked to the Tegui app, you can receive the call notification on your mobile even if the monitor's doorbell is muted or faulty.
👉 Related article: How to receive video doorbell calls on your mobile with the Tegui app
Do you need to replace your Tegui monitor?
If after following all these steps the doorbell still does not work and the monitor needs replacement, in our store you will find original Tegui monitors compatible with your current installation, without needing to change the wiring.