1. Introduction
This manual provides essential instructions for the proper setup, operation, and maintenance of your Sommer 4020 TX03-868-4 4-channel remote control. Please read this manual thoroughly before using the device to ensure safe and efficient operation.
2. Product Overview
The Sommer 4020 TX03-868-4 is a high-quality 4-channel remote control designed for various applications, including garage door operators, gate operators, roller shutters, and lighting systems. It operates on a secure 868.8 MHz frequency using the Somloq rolling code system for enhanced security.

Image 1: Sommer 4020 TX03-868-4 Remote Control. This image displays the sleek, compact design of the remote control, featuring four red buttons and the Sommer branding.
Key Features:
- 4 Channels: Allows control of up to four different devices.
- Frequency: Operates at 868.8 MHz for reliable signal transmission.
- Security: Features the Somloq rolling code system, offering high protection against unauthorized access with 74 trillion possible combinations.
- Compatibility: 100% compatible with Sommer 4020, Sommer 4031, and Sommer 4025 systems.
- Compact Design: Dimensions of 87 x 12 x 24 mm for easy handling.
- Long Battery Life: Optimized for low power consumption, extending battery life.
3. Setup
3.1 Battery Installation
The remote control requires one CR123A battery (included). To install or replace the battery:
- Carefully open the remote control casing.
- Insert the CR123A battery, ensuring correct polarity (+/-).
- Close the casing securely.
3.2 Programming the Remote Control
To program your Sommer 4020 TX03-868-4 remote control, you will need to pair it with your specific Sommer receiver or operator unit. The exact programming steps vary depending on the model of your receiver/operator.
General steps typically involve:
- Accessing the programming mode on your Sommer receiver/operator (refer to its specific manual).
- Pressing a button on the new remote control to transmit a signal.
- Confirming the pairing on the receiver/operator.
For detailed programming instructions, please consult the user manual for your Sommer garage door opener, gate operator, or other compatible device. You may also find specific guides on the official Sommer website or from your product supplier.
4. Operating Instructions
Once programmed, your Sommer 4020 TX03-868-4 remote control is ready for use.
- Button Functionality: Each of the four buttons on the remote control can be programmed to operate a different function or device. Press the corresponding button briefly to activate the programmed function (e.g., open/close garage door, turn on/off lights).
- Operating Range: The typical operating range is approximately 50 meters, depending on environmental conditions and obstacles. For increased range (up to 150-200 meters), an external antenna for your receiver may be required.
- Signal Transmission: The 868.8 MHz frequency ensures reliable signal transmission. Avoid prolonged button presses as this frequency is designed for short, burst transmissions.
5. Maintenance
5.1 Battery Replacement
When the remote control's range decreases significantly or it stops responding, the battery may need replacement. Follow the steps in Section 3.1 to replace the CR123A battery.
5.2 Cleaning
Clean the remote control with a soft, dry cloth. Do not use abrasive cleaners or solvents, as these can damage the casing or internal components.
5.3 Storage
Store the remote control in a dry place, away from extreme temperatures and direct sunlight. Avoid dropping the device or exposing it to excessive moisture.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Remote control does not work. | Dead or low battery. Remote control not programmed. Receiver out of range or faulty. | Replace battery (CR123A). Re-program the remote control (refer to Section 3.2). Move closer to the receiver; check receiver's power and functionality. |
| Reduced operating range. | Low battery. Environmental interference or obstacles. Receiver antenna obstructed or damaged. | Replace battery. Ensure clear line of sight; minimize interference from other electronic devices. Check receiver antenna; consider an external antenna for extended range. |
| Intermittent operation. | Weak battery. Signal interference. Loose battery connection. | Replace battery. Identify and remove sources of interference. Ensure battery is seated correctly. |
7. Specifications
| Model: | Sommer 4020 TX03-868-4 (Internal Reference: RR-399) |
| Brand: | Sommer |
| Channels: | 4 |
| Frequency: | 868.8 MHz |
| Security: | Somloq Rolling Code System |
| Dimensions (H x W x D): | 87 x 12 x 24 mm |
| Weight: | 50 grams |
| Battery Type: | 1 x CR123A (included) |
| Operating Range: | Approx. 50 meters (up to 150-200 meters with external antenna) |
| Compatibility: | Sommer 4020, Sommer 4031, Sommer 4025 |
8. Warranty and Support
For information regarding the warranty period and terms for your Sommer 4020 TX03-868-4 remote control, please refer to the documentation provided at the time of purchase or contact your retailer. For technical support or further assistance, please visit the official Sommer website or contact their customer service department.
Sommer is committed to customer satisfaction and provides support for their products.





