Why replace the Tegui 374494 monitor?
The Tegui 374494 monitor (equivalent to BTicino Series 8) is one of the most installed models in Spanish homes and communities. It works with the 2-wire BUS SCS system from Tegui/BTicino, which greatly simplifies its replacement: you only need two cables, with no polarity.
The most common reasons to replace it are:
- The screen does not turn on or shows a distorted image
- No audio is heard or there is interference
- The door release button does not respond
- The monitor is over 10 years old and starts to fail
- Lack of spare parts on the market due to being discontinued
- You want to modernize the installation without changing the wiring
The good news is that the 2-wire BUS SCS system allows you to replace the monitor without changing the existing wiring, as long as the new monitor is compatible.
How to replace the Tegui 374494 monitor step by step
You can make the replacement in less than 10 minutes, without construction work and without advanced electrical knowledge.
What you need
- Compatible replacement monitor (see options below)
- Small flathead screwdriver
- Phone to photograph the current connection
- 5-10 minutes
1. Cut the power
Locate the circuit breaker for the video intercom in your electrical panel and turn it off. Safety first.
2. Remove the old monitor
Loosen the screws on the casing (usually at the bottom or back) and carefully separate the monitor from the wall. You will see two cables connected to the terminals.
3. Photograph the connection
Before touching anything, take a photo with your phone of the connected cables. Although the 2-wire system has no polarity, it is good practice to document the existing installation.
4. Disconnect the cables
Loosen the terminal screws and carefully remove the two cables from the old monitor without damaging the insulation.
5. Connect the new monitor
Insert the same cables into the terminals of the new monitor and tighten them well. Remember: in the 2-wire BUS SCS system, the order of the cables does not matter.
6. Attach the monitor and test
Screw the new monitor to the wall, restore power at the electrical panel, and test from the outdoor panel that the image, audio, and door opener work correctly.
Which monitors are compatible with the Tegui 374494?
To replace 374494 you need a monitor that works with the 2-wire BUS SCS system from Tegui/BTicino. These are the options available in our store according to your needs:
Direct replacement: Tegui Serie 8 Monitor – Ref. 374494 | 99.95 €
If you want a direct replacement maintaining the same features, the Serie 8 Monitor (374494) itself is the simplest option. Same 2-wire wiring, same outdoor panel, no changes in installation.
Economical option: Tegui Classe 100V16B Monitor – Ref. 344652 | 102.00 €
Color screen and hands-free. Compatible with 2-wire system. Ideal to replace 374494 maintaining basic features with a more modern design.
5" screen: Tegui Classe 100V16B Monitor – Ref. 374511 | 119.95 €
Hands-free monitor with 5-inch screen. Greater visual comfort compared to the original 374494. Compatible with green configurators of the 2-wire system.
Modern design: Tegui Classe 100V16E Monitor – Ref. 374521 | 151.00 €
Improved version with higher resolution screen and more modern design. Fully compatible with existing 2-wire installations.
Replacement + WiFi: Tegui Classe 100X16E WiFi Monitor – Ref. 344786 | 199.95 €
Monitor with WiFi connectivity that allows you to receive calls and see the door from your smartphone. Compatible with 2-wire BUS SCS system. Recommended for installations that want to add smart features without changing wiring.
Premium replacement: Classe 300EOS Black WiFi Monitor – Ref. 344884 | 443.96 €
For high-end installations: premium touchscreen, WiFi, and compatibility with Amazon Alexa, also over existing 2-wire cabling.
Comparison table: choose according to your need
| Need | Recommended monitor | Ref. | WiFi | Price |
|---|---|---|---|---|
| Direct identical replacement | Series 8 Monitor | 374494 | No | 99,95 € |
| Modern economical replacement | Classe 100V16B | 344652 | No | 102,00 € |
| Larger screen (5") | Classe 100V16B 5" | 374511 | No | 119,95 € |
| Premium design without WiFi | Classe 100V16E | 374521 | No | 151,00 € |
| Replacement + WiFi | Classe 100X16E | 344786 | Yes | 199,95 € |
| Replacement + WiFi + Alexa | Classe 300EOS Black | 344884 | Yes | 443,96 € |
The green configurator: key to compatibility
One of the most important elements when replacing the Tegui 374494 monitor is the green configurator. This small component determines the monitor’s address within the system and is essential for the new monitor to work correctly.
- Each apartment has a unique position assigned in the configurator
- The new Classe 100 monitor includes its own green configurator
- You must replicate the same configuration the old monitor had
- Incorrect configuration can cause the monitor not to receive calls or interfere with other apartments
Common errors when replacing the 374494 monitor
- No image on screen: Check the polarity of the 2 wires on the monitor terminal.
- The doorbell rings but there is no video: Check that the green configurator is properly inserted and programmed.
- Interference with other monitors: Verify that no two monitors have the same address in the configurator.
- Door won’t open: Check the opening relay programming on the outdoor panel.
- Screen with noise or blank image: This may indicate a line termination problem.
Don’t know which system you have?
Easy: if you see only 2 wires on the current monitor terminal, you have a 2-wire BUS SCS system. If you see 4 or more wires, you have a 4+N system (conventional analog) and will need specific advice.
⚠️ Have questions? Send us a photo of your current installation and we’ll confirm compatibility before you buy. We’ll advise you within 24 hours.
